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': '35-year-old Raymond presents with a painless indurated ulcer on the penis with enlarged genital non-tender lymphnode. What is the diagnosis ? \nSelect and explain. \nA. Chancroid, B. Herpes genitalis, C. Syphilis, D. LGV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The presence of painless indurated ulcer and a non-tender lymph node is suggestive of primary syphilis.', 'role': 'assistant'}]