This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'Bullous pemphigoid is characterized by \nSelect and explain. \nA. Blisters coming on uicarial skin, B. A positive Nikolsky sign, C. Easily rupturing blisters, D. Acantholysis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Bullous pemphigoid is characterized by non-acantholytic blisters on trunk and limbs.It is characterized by a negative Nikolsky's sign, so B is incorrect.Blisters of bullous pemphigoid are tense and not at all easily ruptured, so C is incorrect.Typical tense blisters of bullous pemphigoid come on red/ uicarial base in the elderly population", 'role': 'assistant'}]