Which one of the following is the mechanism of action of oral contrace

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Which one of the following is the mechanism of action of oral contraceptive pills?

They kill the egg.
They kill the sperm.
They kill the zygote.
They inhibit the release of egg.
This question was previously asked in
UPSC NDA-1 – 2022
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The correct option is D.
Oral contraceptive pills primarily work by inhibiting ovulation, which is the release of the egg from the ovary.
Combined oral contraceptive pills (containing estrogen and progestogen) and progestogen-only pills have multiple mechanisms of action, but the inhibition of ovulation is the most significant. They also cause changes in cervical mucus (making it thicker and less penetrable by sperm) and the uterine lining (making it less receptive to implantation), but preventing the release of the egg is the primary way they prevent pregnancy. They do not kill the egg, sperm, or a formed zygote.

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