This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Eosinophilic Dermatoses, Subject name: Skin
12 years old male presented with intensely itchy grouped vesicles on buttock, trunk and scalp. On exposure to wheat they exaggerate. Diagnosis is - 
Select and explain. 
A. Herpes simplex, B. Dermatitis herpetiformis, C. Pemphigus vulgaris, D. Bullous impetigo
B: Dermatitis herpetiformis
Answer: B: Dermatitis herpetiformis 
Explanation: Ans is 'b' i.e. Dermatitis herpetiformis o Among given options only dermatitis herpetiformis is a gluten sensitivity disorder and aggravates on on eating gluten (wheat, rye, barley).Other features in favour of diagnosis areo Intense itching (characteristic feature)o Distribution of lesion - buttock, trunk and scalpo Age group - DH is commonly seen in 2nd to 3rd decade.o Has been explained in previous sessions.