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: Medicine
[{'content': 'In primary syphillis the lesion seen is- \nSelect and explain. \nA. Indurated ulcer, B. Multiplicity of lesion, C. Painful ulcer, D. Bleeding ulcer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]