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': 'Which pa of Henle loop is less permeable to water? \nSelect and explain. \nA. Thin descending limb, B. Thin ascending segment/limb., C. Thick ascending segment/limb., D. Thick descending segment/limb.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Thin ascending segment/limb.REABSORPTION IN THIN ASCENDING LIMB:NaCl- reabsorption occurs -Due to high NaCl- permeability.Less permeable to water.Tubular fluid is iso-osmotic.', 'role': 'assistant'}]