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The most important component of the oral contraceptive pill is

1. growth hormone
2. thyroxine
3. luteinizing hormone
4. progesterone

Correct answer: progesterone

Solution

Progesterone (usually given as a synthetic progestin) is the key hormone in oral contraceptive pills because it inhibits ovulation and thickens cervical mucus. This makes fertilization and implantation less likely.

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