Assertion (A) Shape of the receptor changes after attachment of chemical messenger. Reason (R) Receptor does not regain original shape after removal of chemical messenger. The correct answer is

Options

1. A(A) and (R) are correct and (R) is the correct explanation of (A)
2. B(A) and (R) are correct but (R) is not the correct explanation of (A)
3. C(A) is correct but (R) is not correct
4. D(A) is not correct but (R) is correct