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
Treatment of dermatitis herpetiformis ? 
Select and explain. 
A. Gluten free diet, B. Dapsone, C. Sulfonamide, D. All of the above
A: Gluten free diet
Answer: A: Gluten free diet 
Explanation: Ans. is 'a' i.e., Cong erythropoetic porphyria Tinea capitis shows greenish fluorescence. Erythrasma gives a coral pink hue. Pseudomonas infection gives a yellowish-green colour