Progestin-estradiol combined contraceptive pills inhibit ovulation by

negative feedback on the release of estrogen from ovary required for follicular development in follicular phase

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preventing the uterine physiological and morphological changes required far implantation

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inhibiting the secretion of follicle stimulating hormone (FSH) and luteinising hormone (LH) that are necessary for ovulation

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both (a) and (c).

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Solution

The correct option is D inhibiting the secretion of follicle stimulating hormone (FSH) and luteinising hormone (LH) that are necessary for ovulation
The presence of progesterone and estrogen prevent the secretion of Follicle Stimulating hormone and Luteinising hormone that are required for maturation of primary follicle and ovulation from the Graffian follicle.
So, the correct option is 'inhibiting the secretion of follicle stimulating hormone (FSH) and luteinising hormone (LH) that are necessary for ovulation'.

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