The hormone is responsible for both uterine contraction and lactation. The hormone increases the reabsorption of water from kidneys.

The correct options are
B vasopressin
C oxytocin
The posterior pituitary gland secretes two hormones: oxytocin and antidiuretic hormone (ADH) or vasopressin. These hormones are synthesized hypothalamus and transported to the posterior pituitary lobe. The hormone oxytocin is responsible for both uterine contraction and lactation. The hormone vasopressin increases the reabsorption of water from kidneys. This is to conserve body water by reducing the loss of water in urine.