For two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

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

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

c. A is true but R is false.

d. A is false but R is true.

Assertion: ln grasshoppers, females are hetero gametic and males are homo gametic.

Reason: ln grasshoppers, male has only one sex chromosome (XO) whereas the female has sex chromosomes (XX).