This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shoulder and arm injuries, Subject name: Orthopaedics
[{'content': 'A 17-year-old high school tennis player sustains a right midshaft clavicle fracture. Which of the following increases the risk of nonunion in the non operative treatment of clavicle fractures \nSelect and explain. \nA. Sling treatment, B. Figure-of-eight bandage treatment, C. Displacement and comminution, D. Male sex', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Displacement and comminution have been shown to increase risk of non-union in nonoperative management. There are no significant differences between outcomes when using sling immobilization versus a figure-of-eight bandage.', 'role': 'assistant'}]