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': 'Buschke-Ollendroff sign is seen in \nSelect and explain. \nA. Primary syphilis, B. Congenital syphilis, C. Secondary syphilis, D. Tertiary syphilis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Buschke-Ollendroff sign -\xa0 deep dermal tenderness on pressing the lesion with a pinhead. Seen in secondary syphilis.', 'role': 'assistant'}]