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
Commonest etiology of erythema multiforme is - 
Select and explain. 
A. Viral, B. Bacterial, C. Food, D. Drugs
A: Viral
Answer: A: Viral 
Explanation: A. i.e. Viral