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: Dental
[{'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: Amongst the given options only chancre (syphilis) causes painless ulcer.', 'role': 'assistant'}]