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
Drug effective against dermatitis herpetiformis: 
Select and explain. 
A. Dapsone, B. Coicosteroids, C. Chloroquine, D. Antihistaminics
A: Dapsone
Answer: A: Dapsone 
Explanation: Dapsone