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 of the following is not true about silver sulfadiazine \nSelect and explain. \nA. Used in burns dressings, B. Antibacterial action against Pseudomonas, C. Has immunomodulatory action, D. Side effect is hypersensitivity reaction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Silver sulfadiazine is the most common dressing used for burns.', 'role': 'assistant'}]