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': 'Avascular necrosis of bone is most common in \nSelect and explain. \nA. Scapula, B. Scaphoid, C. Calcaneus, D. Cervical spine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Scaphoid', 'role': 'assistant'}]