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
Erythema multiforme ? 
Select and explain. 
A. Staphylococcus, B. TB, C. HSV, D. EBV
C: HSV
Answer: C: HSV 
Explanation: Ans. is 'c' i.e., HSV Idiopathic erythema multiforme is the most common cause of EM. o 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 o Bacteria -9 Streptococci, tuberculosis Fungal --> Coccidioidomycosis, Histoplasmosis. Drugs ----> Antibiotics (Sulphonamide), Phenytoin, NSAIDS. o Autoimmune disease --> SLE, thyroiditis, RA Others --> Sarcoidosis, Pregnancy, Malignancy