This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Aerial disorders, Subject name: Surgery
[{'content': 'This catheter is used for: \nSelect and explain. \nA. Drainage of urinary bladder, B. Parenteral hyperalimentation, C. Removal of embolus from blood vessels, D. Ureteric catheterization', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]