Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).

Assertion (A) : Doctors sometimes inject oxytocin to induce labour during childbirth.

Reason    (R)  : Oxytocin causes uterine contractions, which helps in the delivery of the baby.

In light of the above statements, choose the correct answer from the options given below. 

Both assertion and the reason are true and the reason is a correct explanation of the assertion.

Assertion (A) states that doctors inject oxytocin to induce labour at the time of parturition, which is true. Oxytocin is commonly administered to pregnant women to stimulate uterine contractions and initiate or strengthen labor.
Reason (R) states that oxytocin causes uterine contractions, which helps in the delivery of the baby. This is also true; oxytocin acts on the smooth muscles of the uterus to stimulate contractions, facilitating the expulsion of the baby during childbirth.