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: Skin
Extermely pruritic excoriation & papules on buttocks with autoantibodies against epidermal transglutaminase and IgA deposition in dermis on immuno-histological examination of normal perilesional skin. Diagnosis is: 
Select and explain. 
A. Pemphigus vulgaris, B. Pemphigoid, C. Linear IgA disease, D. Dermatitis herpetiformis
D: Dermatitis herpetiformis
Answer: D: Dermatitis herpetiformis 
Explanation: D i.e. Dermatitis herpetiformis