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: Medicine
[{'content': 'Methylene blue test is used to detect \nSelect and explain. \nA. Microorganisms, B. Sucrose, C. Fats, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Methylene blue test is used to detect\xa0Microorganisms.', 'role': 'assistant'}]