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': 'Lues maligna is caused by? \nSelect and explain. \nA. Borrelia, B. Leptospira, C. Brachyspira, D. Treponema', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e.,TreponemaLues maligna represents a rare form secondary syphilis ( caused by treponema pallidum).also known as 'malignant syphilis' or 'ulceronodular syphilis'.", 'role': 'assistant'}]