This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Antimetabolites and Quinolones, Subject name: Pharmacology
[{'content': 'Which of the following is not true for silver sulfadiazine? \nSelect and explain. \nA. The concentration used is 1%, B. It is used for preventing infections at burnt surfaces, C. It can used for treating established infections at burnt surfaces, D. It is active against Pseudomonas', 'role': 'user'}, {'content': 'Answer: C \nExplanation: SILVER SULFADIAZINE It is used topically as 1% cream. It is active against a large number of bacteria and fungi, even those resistant to other sulfonamides e.g. Pseudomonas It slowly releases silver ions, major active anti-microbial component It is highly effective at preventing infections of burnt surfaces It is not good for treatment of established infections', 'role': 'assistant'}]