Match the disorder given in Column-I with the feature most closely related to the disorder in Column-II and select the correct match from the codes given:
| Column-I | Column-II | ||
| A. | Asthma | P. | Inflammation of bronchi and bronchioles |
| B. | Emphysema | Q. | Damage to alveolar walls |
| C. | Occupation lung disease | R. | Pulmonary fibrosis |
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | P | R |
| 3. | Q | R | P |
| 4. | R | Q | P |