This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune Skin Disorders, Subject name: Skin
Gluten free diet is beneficial in: 
Select and explain. 
A. Psoriasis, B. Exfoliatrive dermatitis, C. Dermatitis herpetiformis, D. Pemphigoid
C: Dermatitis herpetiformis
Answer: C: Dermatitis herpetiformis 
Explanation: Ans is 'c' i.e, Dermatitis herpetiformis