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Amniocentesis is a procedure used for prenatal detection of genetic disorders and metabolic defects.

1. Birth control pill — Stops ovulation
2. Barrier method — Blocks sperm from reaching the cervix
3. Surgical vasectomy — Sperm absent in semen
4. Intrauterine device — Stops embryo implantation

Correct answer: Surgical vasectomy — Sperm absent in semen

Solution

Vasectomy is a surgical method of male sterilization where the vas deferens is cut or tied, preventing sperm from being present in the semen.

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