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Oral contraceptive pills do not

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inhibit ovulation

thicken cervical mucus

prevent implantation

increase phagocytosis of sperm

answer is D.

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Detailed Solution

IUDs increase the phagocytosis of sperm.

Mechanism of action of oral contraceptive pills:

Inhibition of ovulation by suppressing the mid cycle LH peak
Thickening of cervical mucus which prevents sperm penetration
Atrophy of endometrium which prevents implantation

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