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: Dental
[{'content': '60 year female with tense bulla in lower extremity and subepidermal bullous lesion on microscopy, diagnosis is \nSelect and explain. \nA. Bullous pemphigoid, B. Pemphigus vulgaris, C. Erythema mulforme, D. Dermas herpeformis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]