D) The First Day of the menstrual flow
Explanation: Menstrual cycle is the monthly cylical changes occuring in the uterus of the post menarch female. It is a part of reproductive system.
It includes :
- Proliferative stage that is the first stage of the cycle hat begins with the menstrual flow of the blood. It includes the shedding of the uterine epithelium with growth of new endometrium.
- Secretory stage that occurs after the ovulation. It is the second half of the menstrual cycle.
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