Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

Question:Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

1.Retention of well-developed corpus luteum

2.Fertilisation of the ovum

3.Maintenance of the hypertrophical endometrial lining

4.Maintenance of high concentration of sex-hormones in the blood stream


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