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
True about patella is 
Select and explain. 
A. Blood supply is by genicular anastomosis, B. One ossification centre at 3-6 years, C. Medial surface attaches to tensor fascia lata, D. Rectus femoris attachment is proximal to vastus intermedius
A: Blood supply is by genicular anastomosis
Answer: A: Blood supply is by genicular anastomosis 
Explanation: PATELLA:- Largest sesamoid bone developed in tendon of quadriceps femoris.Triangular shape.Apex, 3 borders( sup, lateral and medial), 2 surfaces( anterior and posterior ). Attachments:-1. Superior border/ base- rectus femoris ,vastus intermedius . Vastus intermedialis attached proximal to rectus femoris.2. Medial border- vastus medialis.3. Lateral border- vastus lateralis.4. Posterior surface- ligamentum patellae. Ossification:- several centers which appear during 3-6 years of age. Fusion complete at pubey.One or two centers at the superolateral angle may form separate pieces of bone, forming bipaite/ tripaite patella. Patella supplied by genicular anastomosis. <img src=" /> {Reference: BDC 6E pg no. 20,21}