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': 'PCT secretes \nSelect and explain. \nA. Sodium, B. Glucose, C. Hydrogen ions, D. Amino acids', 'role': 'user'}, {'content': "Answer: C \nExplanation: PCT secretes H+ into tubule thus helping in excretion . Ref: Ganong's review of medical physiology; 24th edition; page no: 685", 'role': 'assistant'}]