The correct option is B ADH
Antidiuretic hormone (ADH) is secreted by posterior pituitary gland and targets nephrons to increase water reabsorption and thereby decreasing water content in urine. Oxytocin facilitates uterine contractions to push the foetus downward which in turn stretches cervix and leads to childbirth. MSH stimulates melanin production from melanocytes. Adrenocorticotropic hormone (ACTH) is secreted by the anterior pituitary gland and targets adrenal cortex to produce its hormones. Thus, the correct answer is option B.