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B
Spermicidal salts
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C
Chemicals that cause automatic abortion
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D
Chemicals that prevent fertilization of ovum
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Solution
The correct option is B Progesterone and estrogen Birth control pills check ovulation in female by inhibiting the secretion of FSH and LH that are necessary for ovulation. It contain small doses of either progesterone alone or a combination of progesterone and estrogen (combined pill).
So, the correct answer is 'Progesterone and estrogen'.