Oral contraceptives inhibit $A$ and implantation as well as the quality of cervical $B$ to prevent the entry of sperms. Choose the correct option for $A$ and $B$ to complete the given statement.
- A$A-$ovulation; $B-$mucus
- B$A-$oogenesis; $B-$structure
- C$A-$oogenesis; $B-$nucleus
- D$A-$spermatogenesis; $B-$mucus
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