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: Skin
[{'content': '19 years male develops painless penile ulcers 9 days after sexual intercourse with a professional sex worker likely diagnosis is: \nSelect and explain. \nA. Chancroid, B. Herpes, C. Chancre, D. Traumatic ulcer', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Chancre', 'role': 'assistant'}]