Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Endometrium is necessary for implantation of blastocyst. Reason R: In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium. In the light of the above statements, choose the correct answer from the options given below:

1. A. Both A and R are true and R is the correct explanation of A.
2. B. Both A and R are true but R is NOT the correct explanation of A.
3. C. A is true but R is false.
4. D. A is false but R is true.

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