This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
The chief source of blood supply to head and neck of femur is derived from 
Select and explain. 
A. Acetabular branches of obturator aery, B. Acetabular branches of medial circumflex femoral aery, C. Retinacular branches of medial circumflex femoral aery, D. Nutrient aery of femur
C: Retinacular branches of medial circumflex femoral aery
Answer: C: Retinacular branches of medial circumflex femoral aery 
Explanation: The head of the femur is paly supplied by a branch of obturator aery along the ligamentum teres.Main aerial supply is from retinacular aeries, branches of the medial femoral circumflex aery.These aeries get injured in intracapsular fracture of neck of femur, leading to avascular necrosis of the head.BDC 6th edition (Abdomen & lower limb) pg: 32