This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Acidification of urine occur in? \nSelect and explain. \nA. Collecting ducts, B. PCT, C. Ascending limb of loop of henle, D. Descending limb of loop of henle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acidification of urine occur in PCTRef: Ganong&;s review of medical physiology; 24th edition; page no; 712', 'role': 'assistant'}]