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: Pathology
[{'content': 'A young patient complains of shooting pain , paraesthesia and tenderness on one side of the palate. Unilateral vesicles appear in clusters. The patient gives previous history of chickenpox. \nSelect and explain. \nA. Herpes zoster, B. Herpes simplex, C. Herpengina, D. Bahcets syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]