Directions In the following questions, a statement of Assertion (A) is followed by a corresponding statement of Reason (R). Of the following statements, choose the correct one.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both A and R are correct; \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \).
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct ; \( \mathrm{A} \) is incorrect.
Assertion (A) Different receptors in the body show selectivity for one chemical messenger over the other.
Reason (R) Their binding sites have different shape, structure and amino acid composition.
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