This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
[{'content': 'Vasopressin acts through which channels in collecting duct? \nSelect and explain. \nA. Aquaporin 1, B. Aquaporin 2, C. GLUT-1, D. GLUT-4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Aquaporin 2a. Principal cells of collecting duct contain a regulated system of water channels antidiuretic hormone (ADH, also called arginine vasopressin, AVP).b. ADH controls permeability of these cells to water by regulating insertion of pre-formed water channels (aquaporin-2, AQP2) into apical membrane.', 'role': 'assistant'}]