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': 'Causative agent of syphilis? \nSelect and explain. \nA. Treponema peunae, B. Treponema endemicum, C. Treponema corateum, D. Treponema pallidum', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Treponema pallidum", 'role': 'assistant'}]