Question

lactation occurs
multiple choice
during pregnancy only,
during gestation.
during both pregnancy and after birth.
during menstruation.

Explanation:

Lactation is the process of producing milk. During pregnancy, hormonal changes start preparing the breasts for milk production. After birth, when the baby suckles, it stimulates further milk production and release, so lactation occurs during both pregnancy (as preparation) and after birth (for feeding the infant). "During pregnancy only" is incorrect as milk production continues post - birth. "During gestation" (which is the same as pregnancy) is also incorrect for the same reason. "During menstruation" is incorrect as menstruation is a different physiological process not related to lactation.

Answer:

C. during both pregnancy and after birth.