In human females, the ovarian cycle begains when the:

Options

A. Reduction of FSH
B. Increase of LH
C. Reduction in estrogen and progesterone
D. None of these

Answer

D

Explanation

If the ovum is not fertilized the corpus luteum in the ovary suddenly involutes and the ovarian hormone (estrogen and progesterone) decreases to low level of secretion. As a result endometrium lining sloughed off in the form of menstrual flow.