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: Pathology
[{'content': 'The oral Lesion of syphilis that is highly infective is a: \nSelect and explain. \nA. Gumma, B. Koplik spot, C. Mucous patch, D. Tabes dorsalis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]