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
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 - 
Select and explain. 
A. Superior gluteal artery, B. Inferior gluteal artery, C. Acetabular branch of obturator, D. Retinacular branches of circumflex femoral arteries
D: Retinacular branches of circumflex femoral arteries
Answer: D: Retinacular branches of circumflex femoral arteries 
Explanation: The major blood supply of femoral head is by lateral (superior) retinacular branch of medial circumflex artery. It is involved in AVN.