LTH (luteotropic hormone/prolactin) is secreted by anterior pituitary gland and targets mammary gland to stimulate breast development and milk production after baby birth; this makes option A correct. Progesterone and estrogen are female sex hormones. Estrogen serves to stimulate the growth of the uterus and the vagina, is necessary for egg maturation as well as for the development of the secondary sex characteristics in females. Both progesterone and estrogen stimulate breast development but do not serve in lactation. This makes options B and C incorrect. Option D is incorrect as aldosterone serves to stimulate renal absorption of sodium ions and excretion of potassium. Correct answer is A.