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': "A patient gives a history of recurrent oral ulcers. The ulcers are small with a yellow floor surrounded by an erythematous halo on the lips. He also has multiple, tender nodules on the skin. He most likely has- \nSelect and explain. \nA. Behcet's syndrome, B. Herpes labialis, C. Fixed drug eruption, D. Pemphigus vulgaris", 'role': 'user'}, {'content': "Answer: A \nExplanation: This patient has : -\n\n\nRecurrent oral ulcers\nUlcers are small with yellow floor surrounded by an erythematous halo aphthous ulcers.\nTender nodules on skin\xa0\xa0→\xa0Erythema nodosum.\n\n\nDiagnosis is Behcet's syndrome.", 'role': 'assistant'}]