Assertion (A) In human beings, the female play a major role in determining the sex of the offspring.
Reason (R) Women have two X-chromosomes.

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true, but R is not the correct explanation of A

C. A is true, but R is false

D. A is false, but R is true

Answer: Option D