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 3-year-old child reports with fever. He has reddish\nyellow ulcers of the facial mucosa and tongue. He is most\nprobably suffering from: \nSelect and explain. \nA. Erosive lichen planus, B. Acute herpetic gingivostomatitis, C. ANUG, D. Leukemia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]