A regular cycling woman is not menstruating which one of the following is the most likely root cause of this?

Options

A. Maintenance of the hypertrophical endometrial lining
B. Maintenance of high concentration of sex-hormones in the blood stream
C. Retension of well-developed corpus luteum
D. fertilisation fo the ovum

Answer

D

Explanation

Maenstruation does not take place if the ovum is fetillised.