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 30-year-old male had severely itchy papulo–vesicular lesions on extremities, knees, elbows and buttocks for one year. Immunofluorescence staining of the lesions showed IgA deposition at dermo-epidermal junction. The most probable diagnosis is – \nSelect and explain. \nA. Pemphigus vulgaris, B. Bullous pemphigoid, C. Dermatitis herpetiforms, D. Nummular eczema', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Itchy papulovesicular lesions on extensor surfaces and deposition of IgA at DEJ suggests the diagnosis of dermatitis herpatiformis, which is associated\xa0with Coeliac disease', 'role': 'assistant'}]