Concept:The joint between the femur and tibia is the knee joint, which is a hinge joint.
Explanation:The femur (thigh bone) and tibia (shin bone) meet at the knee.
The knee mainly allows bending and straightening, like a door hinge.
This type of joint permits movement in one plane only — flexion and extension.
A hinge joint is therefore the correct classification.
A ball-and-socket joint, such as the hip or shoulder, allows movement in many directions.
A pivot joint, like the neck or forearm, allows rotation around a single axis.
A gliding joint, like the wrist or ankle, allows bones to slide over flat surfaces.
None of these match the knee's structure and movement pattern.
The knee is also supported by ligaments and cartilage, but its functional joint type is hinge.
Answer:A. hinge joint