A) killing the ovum
B) blocking fertilization
C) preventing ovulation
D) preventing implantation
Correct Answer: C
Solution :
Oral contraceptive or physiological device prevent pregnancy by preventing ovulation, Oral contraceptive (birth control pills) contain synthetic formed progesterone and oestrogen and check ovulation in human female by inhibiting the secretion of follicle stimulating hormone and luteinising hormone, those are necessary for ovulation.
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