This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pemphigus, Subject name: Skin
[{'content': 'Commonest variety of pemphigus: \nSelect and explain. \nA. Pemphigus vulgaris, B. Pemphigus vegetans, C. Pemphigus foliaceus, D. Pemphigus erythematosia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans is 'a' i.e, Pemphigus vulgaris", 'role': 'assistant'}]