Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Surgical methods of contraception are highly effective but their reversibility is very poor. Reason (R): Surgical intervention blocks gamete transport and thereby prevents conception. In the light of the above statements, choose the most appropriate answer from the options given below:

Step-by-step solution

Surgical methods (sterilisation such as vasectomy and tubectomy) are highly effective terminal methods of contraception, but their reversibility is very poor due to surgical complexity and tissue scarring. Thus, Assertion (A) is correct. The mechanism of action of these methods is the physical blockage of gamete transport, which prevents conception. Thus, Reason (R) is also correct. However, while the blockage of gamete transport explains why these methods are highly effective at preventing pregnancy, it does not e