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': "'Row of tombstones' appearance is seen in : \nSelect and explain. \nA. Irritant dermatitis, B. Pemphigus, C. Pemphigoid, D. Harpes zoster", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B. i.e. Pemphigus', 'role': 'assistant'}]