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': 'Carbonic anhydrase in the kidney tubular cells is known to be associated with: \nSelect and explain. \nA. Urea, B. Chloride, C. Bicarbonate ion, D. Carbohydrate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]