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: Skin
[{'content': "Tzank test' is positive in the following, except: \nSelect and explain. \nA. Herpes Zoster, B. EBV, C. Herpes Simplex, D. Varicella", 'role': 'user'}, {'content': 'Answer: B \nExplanation: EBV', 'role': 'assistant'}]