| Assertion(A): | During HIV infection, the patient becomes immuno-deficient. | 
| Reason(R): | HIV Virus attacks helper T-lymphocytes and decreases their cell count. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | Techniques like CT and MRI are very useful in detection of cancers of internal organs. | 
| Reason(R): | Techniques of molecular biology can also be used to detect diseases having genetic susceptibility. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) | 
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | Adolescence is a very vulnerable phase of mental and psychological development of an individual. | 
| Reason(R): | Addiction to drugs or alcohol is very common during adolescence. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | Nicotine in tobacco is a sympathomimetic compound. | 
| Reason(R): | Nicotine stimulates the release of adrenaline into blood. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | With time, there is greater intake and addiction of drugs among addicts. | 
| Reason(R): | With repeated use of drugs, tolerance level of receptors declines. | 
| 1. | Both (A) and (R)are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | Use of cocaine causes a temporary sense of euphoria. | 
| Reason(R): | It has a stimulatory effect on central nervous system by promoting release of GABA | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) | 
| 2. | Both (A) and (R) are true and (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion: | Opioids are stimulants | 
| Reason: | Opioids have receptors only in brain. | 
| 1. | Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. | 
| 2. | Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. | 
| 3. | Assertion is true but Reason is false. | 
| 4. | Both Assertion and Reason are false. | 
| Assertion(A): | Morphine is very useful in patients undergoing surgery. | 
| Reason(R): | It is a very effective sedative and pain killer. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion(A): | Anamnestic response is due to memory cells. | 
| Reason(R): | The predominant antibody in anamnestic response is lgM. | 
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). | 
| 3. | (A) is true but (R) is false. | 
| 4. | Both (A) and (R) are false. | 
| Assertion: | Tissue and blood group match is needed for organ transplant between recipient and donor. | 
| Reason: | Transplantation helps the patient of organ failure to live a normal life. | 
| 1. | Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. | 
| 2. | Both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. | 
| 3. | Assertion is true but Reason is false. | 
| 4. | Both Assertion and Reason are false. |