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': 'Aseptic necrosis is commoner in fractures of: September 2011 \nSelect and explain. \nA. Calcaneum, B. Scaphoid, C. Cuboid, D. Trapezium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Scaphoid The blood supply of the Scaphoid is precarious In fractures through the waist, there is high probability of the proximal fragment becoming avascular', 'role': 'assistant'}]