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': 'Following are true about HCO3-except: \nSelect and explain. \nA. Extracellular concentration 25 m mol, B. Intracellular concentration 10 m mol, C. 7.5% solution gives 2 nmols, D. In kidney, HCO3- is produced by carbonic anhydrase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 7.5% solution gives 2n molsConcentration of bicarbonate- Intracellular : 10 mmoVLQ- Extracellular : 27 mmol/LQIn kidney bicarbonate is produced by carbonic anhydraseQ.', 'role': 'assistant'}]