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': 'The diagnostic technique shown in colour palate is used for diagnosis of \nSelect and explain. \nA. Syphilis, B. Typhoid, C. Cholera, D. Tetanus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The figure shows dark field microscopy which is used for the diagnosis of T. pallidum.', 'role': 'assistant'}]