This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Bones ossified at bih 
Select and explain. 
A. Upper end of humerus, B. Lower end of humerus, C. Lower end of femur, D. Lower end of tibia
C: Lower end of femur
Answer: C: Lower end of femur 
Explanation: Secondary centers around knee joint ( distal femur and proximal tibia) appear during last weeks of intrauterine life (or immediately after bih) Primary center of all tarsal bones (except talus, calcaneus and cuboid) appear after bih Ref: Gray's39e/p185-210