A) Lippes loop - Increase phagocytosis of sperms in uterus
B) LNG-20 - Make uterus unsuitable for implantation and cervix hostile to sperms
C) CuT - Cu ions released suppress sperm motility and the fertilising capacity of sperms
D) Implant - Inhibit ovulation and implantation as well as alter the quality of cervical mucus to retard entry of sperms
Correct Answer: C
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