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': 'A 28-year-old patient has multiple grouped papulovesicular lesions on both elbows, knees buttocks and upper back associated with severe itching. The most likely diagnosis is – \nSelect and explain. \nA. Pemphigus vulgaris, B. Bullous pemphigoid, C. Dermatitis herpetiformis, D. Herpes Zoster', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Look for itching → Severe itching\nPapulovesicular lesion\nOn extensors (knees, elbows), scapular region (upper back), buttock.\nAge → 28 years', 'role': 'assistant'}]