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': 'Erythema multiforme is most commonly caused by? \nSelect and explain. \nA. Herpes simplex, B. Idiopathic, C. TB, D. Drugs', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Idiopathic Idiopathic erythema multiforme is the most common cause of EM. Herpes simplex is the most impoant infectious cause of EM. Causes of Erythema multiforme Idiopathic --) Most common cause Viral --> HSV (most impoant) HBV, Mumps, Adenovirus Bacteria - Streptococci, tuberculosis Fungal --> Coccidioidomycosis, Histoplasmosis. Drugs ---> Antibiotics (Sulphonamide), Phenytoin, NSAIDS. Autoimmune disease --> SLE, thyroiditis, RA Others --> Sarcoidosis, Pregnancy, Malignancy.", 'role': 'assistant'}]