This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Avascular Necrosis & Osteochondroses, Subject name: Orthopaedics
[{'content': 'The most common complication of fracture neck femur is: \nSelect and explain. \nA. Non-union, B. Avascular necrosis, C. Arthritis of hip, D. Malunion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Avascular necrosisAVN > Non-union > ArthritisIncidence wise, the AVN is the most common complication of fracture neck femur followed by non-union and then arthritis of the hip joint.', 'role': 'assistant'}]