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: Orthopaedics
[{'content': 'Vascular injury during childhood is common in fracture of - \nSelect and explain. \nA. Lower end of humerus, B. Lower end of radius, C. Upper end of femur, D. Upper end of radius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: VIC develops most commonly after supracondylar humerus fracture in children.', 'role': 'assistant'}]