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: Surgery
[{'content': 'Which among the following causes staining of burnt area \nSelect and explain. \nA. Sulfamylon, B. Povidone iodine, C. Silver nitrate, D. Mafenide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Silver nitrate causes staining of burnt area.', 'role': 'assistant'}]