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': 'Hypeonic urine is excreted due to absorption of water in: \nSelect and explain. \nA. Collecting ducts, B. DCT, C. Ascending pa of loop of Henley, D. Descending pa of loop of Henley', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Collecting DuctOsmolality of urine depends on the action of vasopressin on the collecting ductsQ. Alteration in water metabolism by vasopressinUrine isotonic to plasmaGFR (ml/min)% of filteredwaterreabsorbedUrine volume(L/d)Urine concentration(mosm /kg H20)Gain /Loss of water inexcess of solute (L/d)12598.72.4290 Vasopressin present12599.70.51400Q (almost 5 timeof plasma)1.9 gainNo vasopressin (Diabetesinsipidus)12587.123.33020.9 loss', 'role': 'assistant'}]