Three of the names below are of the same kind of body part. Choose the odd one out: Femur, Biceps, Humerus, Tibia.

The femur, the humerus and the tibia are bones — the thigh bone, the bone of the upper arm and the shin bone. The biceps is a muscle, a band of soft flesh that shortens and pulls on a bone to bend the arm. All four are parts of the limbs known by their proper anatomical names, which is what hides the split; the tie among the other three is that each is a piece of the skeleton.