Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Menstruation only occurs if the released ovum is not fertilized. Reason R : In the absence of fertilization, the corpus luteum degenerates, leading to a decrease in progesterone which causes the disintegration of the endometrium. In the light of the above statements, choose the most appropriate answer

Step-by-step solution

Assertion A is correct because menstruation is the shedding of the endometrial lining, which only happens if the released ovum is not fertilized. Reason R is also correct and provides the correct explanation for Assertion A . In the absence of fertilization, the corpus luteum degenerates. This degeneration causes a sharp decline in the secretion of progesterone. Since progesterone is essential for maintaining the endometrial lining of the uterus, its decreased level leads to the disintegration of the endometrium, r