The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The primary site of action of antidiuretic hormone is on the:   (A) Distal tubules and collecting ducts in the kidney   (B) Afferent arterioles of the glomeruli   (C) Thirst center in the hypothalamus   (D) Osmoreceptors in the hypothalamus
['(A) Distal tubules and collecting ducts in the kidney <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Distal tubules and collecting ducts in the kidney \n (B) Afferent arterioles of the glomeruli \n (C) Thirst center in the hypothalamus \n (D) Osmoreceptors in the hypothalamus <> possible answers', '  The primary site of action of antidiuretic hormone is on the: <> context@']