Answer:
Option-A
Step-by-step explanation
Oxytocin hormone is released during labour which helps contract the uterus after the delivery. The oxytocin hormone thus helps the labour process and healing of the body as it reduces the blood loss.
The oxytocin hormone is also released when the newborn baby or infant suckles at mothers nipples which help the milk to let down for the baby and promotes child bonding but it also causes menstrual-like cramps in the uterus.
Thus, Option-A is the correct answer.