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Oral contraceptive pills prevent ovulation by

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thickening cervical mucus

altering the endometrium of the uterus

preventing the production of oestrogen from the ovary

inhibiting the release of gonadotropins from anterior pituitary

answer is B.

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Detailed Solution

Birth control pills contain either an oestrogen and progestin combination or progestin alone. These hormones in the pill prevent ovulation by inhibiting the release of LH from anterior pituitary through a negative feedback mechanism.

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