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: Anatomy
[{'content': 'Most common site for avascular necrosis of femur is: \nSelect and explain. \nA. Subcapital, B. Transcervical, C. Trochanteric, D. Basal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Subcapital fracture Avascular necorsis & Non union are most common in subcapital type of fracture neck femur Q & least common in basal neck femur Q.', 'role': 'assistant'}]