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: Pathology
[{'content': 'Prodrornal symptoms precede 1 to 2 days before the onset of disease in \nSelect and explain. \nA. viral fever, B. erythema multiforme, C. pemphigus, D. pemphigoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]