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 catheter materials is most suited for long-term use is? \nSelect and explain. \nA. Latex, B. Silicone, C. Rubber, D. Polyurethane', 'role': 'user'}, {'content': "Answer: B \nExplanation: Silicone can remain in situ for 12 weeks. Ref: Campbell's Urology 8th Edition, Page 112", 'role': 'assistant'}]