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': 'Commonest etiology of erythema multiforme is - \nSelect and explain. \nA. Viral, B. Bacterial, C. Food, D. Drugs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Viral', 'role': 'assistant'}]