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': 'Allergic content in LA: \nSelect and explain. \nA. Methyl paraben., B. Sodium metabisulfite, C. Latex, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Allergic content in LA\n\xa0\nParaben\xa0 >>>\xa0\xa0\xa0\xa0\xa0\xa0 Sodium\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 >>>\xa0 Latex\n\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Metabisulfate', 'role': 'assistant'}]