Which of the following statements are true/false?
$(a)$ Calcitonin regulates calcium metabolism.
$(b)$ Oxytocin stimulates contraction of uterine muscles during childbirth.
$(c)$ Graves' disease is caused by the underactivity of the adrenal gland.
$(d)$ $ADH$ stimulates water reabsorption and increases urine production.

• A
  $(a)$ and $(b)$ are true,while $(c)$ and $(d)$ are false.
• B
  $(a)$ and $(b)$ are true,while $(c)$ and $(d)$ are false.
• C
  $(a)$ and $(d)$ are true,while $(b)$ and $(c)$ are false.
• D
  $(a), (b)$ and $(c)$ are true,only $(d)$ is false.