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': 'Hard chancre is seen in – \nSelect and explain. \nA. Chancroid, B. Syphilis, C. Tularemia, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lesion of primary syphilis\xa0\xa0→\xa0\xa0\xa0\xa0 Chancre (Hard - chancre)\nLesion of H. Ducreyi\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0→\xa0 Chancroid (Soft - chancre)', 'role': 'assistant'}]