The correct option is A Thyroxine
Thyroxine is a thyroid hormone which targets all tissues and stimulates metabolic rate, growth and development. This makes option A correct. GH is the growth hormone, secreted by anterior pituitary, which targets soft tissues and bones and serves to stimulate cell division, protein synthesis and bone growth. Option C is incorrect. Adrenocorticotropic hormone (ACTH) is secreted by anterior pituitary which targets the adrenal cortex to stimulate secretion of corticoids and sex hormones. Option D is incorrect. Follicle stimulating hormone (FSH) is one of the gonadotropins secrete by anterior pituitary; FSH promote spermatogenesis in seminiferous tubules of male and follicle development in females. Option B is incorrect. Correct answer is A.