(A) : In mammals insulin is synthesized in pancreas in mature form.
(R) : It can be inactivated by breaking two disulphide bridges.
A. If both (A) and (R) are true and (R) is the correct explanation of (A).
B. If both (A) and (R) are true but (R) is not the correct explanation of (A).
C. If (A) is true but (R) is false.
D. If both (A) and (R) are false.