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Q.

Menstruation occurs due to

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a

Rising levels of LH

b

Rising levels of Progesterone

c

Declining levels of Progesterone

d

Rising levels of Estrogen

answer is C.

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Detailed Solution

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The cycle starts with the menstrual phase, when menstrual flow occurs and it lasts for 3-5 days. The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels which forms liquid that comes out through vagina. Menstruation occurs when progesterone level decreases in the blood.

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Menstruation occurs due to