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': "The instrument shown below is \nSelect and explain. \nA. Judkins catheter, B. Fogarty's catheter, C. Pigtailed catheter, D. Simmons catheter", 'role': 'user'}, {'content': "Answer: B \nExplanation: This is Fogarty's catheter used in embolectomy.", 'role': 'assistant'}]