Identify the contraceptive measure which can not be practiced by human females.

Vasectomy

The correct answer is Option (3) - Vasectomy

Vasectomy is a permanent contraceptive method for males, not females. Sterilisation procedure in the male is called ‘vasectomy’ and that in the female, ‘tubectomy’. In vasectomy, a small part of the vas deferens is removed or tied up through a small incision on the scrotum whereas in tubectomy, a small part of the fallopian tube is removed or tied up through a small incision in the abdomen or through vagina. These techniques are highly effective but their reversibility is very poor. It involves the surgical cutting or blocking of the vas deferens, which prevents the release of sperm during ejaculation.

In contrast, the other options (IUDs, Tubectomy, and Diaphragms) are contraceptive measures that can be practiced by human females.