A) Retention of well-developed corpus luteum
B) Fertilization of the ovum
C) Maintenance of the hypertrophical endo- metrial lining
D) Maintenance of high concentration of sex hormones in the blood stream
Correct Answer: B
Solution :
Fertilization of ovum is most likely root cause why menstruation is not taking place in regularly cycling human female. In order for fertilization to occur, one of these sperms must attach itself to the ovum and penetrate its outer surface.
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