This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Vasopressin acts bya) Water transport across collecting ductb) Water absorption at medullary ductsc) Water secretion at loop of Henled) Water transport at PCT \nSelect and explain. \nA. ab, B. a, C. ad, D. bc', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angiotensin II acts on \n\nPCT\nThick ascending limb of loop of Henle\nDCT\nCollecting duct\n\n\xa0Aldosterone acts on\n\nLate DCT\nCollecting duct\n\n\xa0ADH acts on\n\nDCT\nCollecting duct\n\n\xa0ANP acts on\n\nDCT\nCollecting duct', 'role': 'assistant'}]