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: Microbiology
[{'content': 'Not used for diagnosis of Leptospirosis: \nSelect and explain. \nA. Microscopic agglutination test, B. Dark field illumination, C. Macroscopic agglutination test, D. Weil-Felix reaction', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Weil-Felix reaction', 'role': 'assistant'}]