Final answer:
The femur is the thigh bone, and it is the longest and strongest bone in the body. None of the other options listed are related to the thigh bone.
Step-by-step explanation:
The femur is the thigh bone and is the single bone of the thigh region. It is the longest and strongest bone in the body. The other options listed, such as fibul/o, rachi/o, humor/o, and patell/o, are not related to the thigh bone.