This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Avascular necrosis and osteochondroses, Subject name: Orthopaedics
[{'content': 'An elderly woman was admitted with a fracture of the neck of right femur which failed to unite. On examination an avascular necrosis of the head of femur was noted. The condition would have resulted most probably from the damage to \nSelect and explain. \nA. Superior gluteal aery, B. Inferior gluteal aery, C. Acetabular branch of obturator, D. Retinacular branches of circumflex femoral aeries', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The major blood supply of femoral head is by lateral(superior) retinacular branch of medial circumflex aery. REF : MAHESWARI 9TH ED', 'role': 'assistant'}]