The correct option is A Oxytocin
The hormone which controls the contraction of uterus after child birth and also produces lactation in the mammary glands is oxytocin. Oxytocin is released from the posterior lobe of the pituitary gland. The release of oxytocin include childbirth, suckling and coitus, the uterine contractions that result may facilitate either childbirth or the ascent of spermatozoa through the fallopiantubes. Oxytocin may also play a role in the initiation of labor. The milk ejection response occurs only in females immediately after childbirth.