Assertion(A): It is the metabolic, physiological, or environmental conditions that regulate the expression of genes.
Reason(R): if the bacteria do not have lactose, they would no longer require the synthesis of the enzyme beta-galactosidase.
Choices for Assertions and reasons:
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. (A) is false, but (R) is true.