Which of the following is considered the 'odd bone out'?

The patella is considered the "odd bone out" because it is a sesamoid bone, meaning it is embedded within a tendon and primarily serves to protect the knee joint and improve leverage of the thigh muscles. Unlike the other bones in the list—fibula, sternum, and clavicle—which are classified as long or flat bones and participate directly in the structural framework of the body, the patella's unique characteristics and role distinguish it from the others. The fibula is a long bone in the lower leg that supports the ankle, the sternum is a flat bone located in the chest that forms part of the rib cage, and the clavicle, or collar bone, is a long bone that connects the arm to the body. The different classifications and functions of these bones highlight why the patella stands out in this grouping.