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
[{'content': 'Drug effective against dermatitis herpetiformis: \nSelect and explain. \nA. Dapsone, B. Coicosteroids, C. Chloroquine, D. Antihistaminics', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Dapsone', 'role': 'assistant'}]