This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Anatomy
All of the following are true about ACL. Except- 
Select and explain. 
A. Prevents anterior motion of femur over tibia, B. Prevents anterior motion of tibia over femur, C. Also provide some secondary varus-valgus stability, D. Is taught in extension of knee
A: Prevents anterior motion of femur over tibia
Answer: A: Prevents anterior motion of femur over tibia 
Explanation: *ACL prevents anterior gliding of tibia over femur. * It is taut during extension and also provides secondary medio- lateral (valgus- Varus) stability. Ref: Spos medicine 4th/e p.83