Medium· Menstrual Cycle (Menarche, Various Events During Menstrual Cycle, etc.)· +4 / −1
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: