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': 'Fracture shaft of femur in adult unites by \nSelect and explain. \nA. 3 to 4 weeks, B. 3 to 4 weeks, C. 3 to 4 months, D. 4 to 6 months', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 3-4 months It is said that a fractured shaft femur should unite in 100 days, plus minus 20 (3 - 4 rnonths)Q. But nonunion is probably best defined by a lack of progression of healing combined with clinical symptoms of discomfo at a minimum of 6 months from the time of treatment. Fuher, a nonunion implies that healing is considered unlikely without fuher intervention.', 'role': 'assistant'}]