Yellow bone marrow occurs in medullary cavity ofA. Short bonesB. Spongy bonesC. Long bonesD. All the above

The correct answer is C. Long bones.

Explanation:
Bone marrow is a soft tissue found in the medullary (or marrow) cavity of bones. It exists in two main forms: yellow bone marrow and red bone marrow.

Yellow bone marrow: This type of marrow is primarily made up of adipose (fat) tissue and is found in the medullary cavities of long bones such as the femur, tibia, and humerus. As individuals age, much of the red bone marrow in long bones is replaced by yellow bone marrow.

Red bone marrow: This is the site of blood cell production and is found mainly in spongy bones (like the ribs, sternum, and vertebrae), as well as in the proximal ends of long bones in children.

Short bones: These bones (such as the carpals and tarsals) typically do not have a large medullary cavity like long bones, and thus they contain mostly red bone marrow in their spongy regions.

Therefore, the primary location of yellow bone marrow is in the medullary cavity of long bones.