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': 'Most impoant buffer system present in the distal convoluted tubule \nSelect and explain. \nA. Bicarbonate, B. Phoshate, C. Protein, D. Ammonia', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ammonia acts as buffer in DCT and PCT. Ref: Ganong's review of medical physiology; 24th edition; page no: 713", 'role': 'assistant'}]