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': 'In fracture of the olecronon, excision of the proximal fragment is indicated in all of the following situations except: \nSelect and explain. \nA. Old ununited fractures, B. Non-aicular fractures, C. Fracture extending to coronoid process, D. Elderly patient', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Fracture extending to coronoid process', 'role': 'assistant'}]