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': 'A most common complication of scaphoid fracture \nSelect and explain. \nA. Malunion, B. Avascular necrosis, C. Wrist stiffners, D. Arthritis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Avascular necrosis is associated with long-term steroid use and drinking too much alcohol. It's most common in people between the ages of 30 and 60 and often affects the hip.\nEarly stages may be symptom-free. Eventually, the affected joint may hurt when weight is put on it or when lying down.\nTreatment includes physiotherapy, surgery and medication.", 'role': 'assistant'}]