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': 'Main risk in fracture Scaphoid is: \nSelect and explain. \nA. Non union, B. Malunion, C. Delayed union, D. Avascular necrosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Avascular necrosis', 'role': 'assistant'}]