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': 'In free water clearance, free water is generated in? \nSelect and explain. \nA. PCT, B. Descending limb of loop of Henle, C. Ascending limb of loop of Henle, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Ascending limb of loop of Henle(Ref: Medical physiology for undergraduate E-book p' 4381Free water or solute free water is generated in the diluting segments of the kidney (i.e. thick ascending limb and early distal tubules, where NaCl is reabsorbed and free water is left in the tubular fluid.", 'role': 'assistant'}]