<prompt> The forward displacement of tibia on the femur is prevented byAnterior cruciate ligamentPosterior cruciate ligamentMedical collateral ligamentLateral collateral ligament  <response>: Anterior cruciate ligament prevents posterior displacement of the femur on the tibia and hyperextension of the knee joint. When the joint is flexed at a right angle, the tibia cannot be pulled anteriorly because it is held by the ACL.watch the wordings carefullyReference: Chaurasia; 6th edition 