[Maintenance of high conce...] Which one of the following is the most likely root cause why menstruation is not taking place in reg

For Competitive Exams

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

Retention of well-developed corpus luteum

Fertilisation of the ovum

Maintenance of the hypertrophical endometrial lining

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

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