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Progesterone, the component of the oral contraceptive pills, prevents pregnancy by

1. preventing the cleavage of the fertilized egg
2. preventing the formation of ova
3. blocking ovulation
4. creating unfavourable chemical environment for the sperms to survive in the female reproductive tract

Correct answer: blocking ovulation

Solution

Progesterone prevents the release of an egg from the ovary, thereby preventing fertilization.

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