This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': "Widal test is a method of? \nSelect and explain. \nA. Direct Coomb's test, B. Indirect Coomb's test, C. Tube agglutination test, D. Precipitation test", 'role': 'user'}, {'content': 'Answer: C \nExplanation: For Typhoid', 'role': 'assistant'}]