This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopaedics Q Bank, Subject name: Orthopaedics
[{'content': 'Treatment for fracture neck of femur in a 70 year old patient with avascular necrosis of head of femur? \nSelect and explain. \nA. Total hip replacement, B. Total knee replacement, C. Unicondylar knee replacement, D. Hemiahroplasty', 'role': 'user'}, {'content': 'Answer: A \nExplanation: THA (Total Hip Ahroplasty) is usually indicated for the patients with a femoral neck fracture who meet the following criteria: Poor general health or frailty. Pathological hip fracture. Severe osteoporosis. Inadequate closed reduction. Displaced fracture that is several days old. Pre-existing hip disease (eg, rheumatoid ahritis, avascular necrosis)(of any age)', 'role': 'assistant'}]