A- iii: The hormone oxytocin is responsible for the rhythmic contractions of the uterus during parturition. B- iv: Prolactin is responsible for the lactation in which the milk formation takes place in the mammary glands of the pregnant female. C- i: LH surge is responsible for the ovulation in which the egg is released from the mature Graafian follicle. D- ii: Progesterone is responsible for the increase in the cell lining leading to implantation and maintenance of pregnancy.