This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pemphigoid Group, Subject name: Skin
[{'content': 'An elderly patient presents with itchy tense blisters on normal looking skin as well as on urticarial plaques as shown below. The most probable diagnosis is: \nSelect and explain. \nA. Pemphigus vulgaris, B. Linear IgA disease, C. Bullous pemphigoid, D. Dermatitis herpetiformis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Bullous pemphigoid.', 'role': 'assistant'}]