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: Social & Preventive Medicine
[{'content': 'Methylene blue reduction test is done for estimating? \nSelect and explain. \nA. Fat content of milk, B. Sugar content of milk, C. Protein content of milk, D. Bacterial activity in milk', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Bacterial activity in milk", 'role': 'assistant'}]