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: Unknown
[{'content': 'Bullous pemphigoidis characterized by \nSelect and explain. \nA. Blisters coming on urticarial skin, B. A positive Nikolsky sign, C. Easily rupturing blisters, D. Acantholysis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bullous pemphigoid ischaracterized by non acantholytic blisters on trunk and limbs. .\nIt is characterized by a negative Nikolsky’s sign, so B is incorrect.\nBlisters of bullous pemphigoid are tense and not at all easily ruptured, so C is incorrect.\nTypical tense blisters of BP come on red/ urticarial base in elderly population', 'role': 'assistant'}]