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: Ophthalmology
[{'content': 'The conversion of CO2 and H2O into carbonic acid during the formation of aqueous humour is catalysed by which one of the following enzymes – \nSelect and explain. \nA. Carboxylase, B. Carbamylase, C. Carbonic anhydrase, D. Carbonic deoxygenase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Question is very simple. Whereever carbonic anhydrase system is present in the body, this reaction is catalysed by carbonic anhydrase, e.g. in eye, stomach, kidney.', 'role': 'assistant'}]