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
Drug causing fixed drug eruption - 
Select and explain. 
A. Sulfonamide, B. Erythromycin, C. Aminoglycoside, D. None
A: Sulfonamide
Answer: A: Sulfonamide 
Explanation: Ans. is 'a' i.e., Sulfonamide Drugs cadging fixed drug eruptiono Paracetamol (Phenacetin)o Sulfonamideso NSAIDso Aspirino Barbiturateso Dapsoneo Tetracyclineso Phenylbutazone