This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of Bone & Fracture Healing, Subject name: Orthopaedics
Diaphysis fracture involves? 
Select and explain. 
A. Skull bones, B. Long bone, C. Sternum, D. Ribs
B: Long bone
Answer: B: Long bone 
Explanation: ANSWER: (B) Long boneREF: Turek's orthopaedics: principles and their application - page 10"The diaphysis is the main or mid-section (shaft) of a long bone"Long bones are found in the extremities: the arms, legs, hands, and feet (but not the wrists or ankles). As their name indicates, long bones have a long central shaft with knobby end portionsShort bones, which are cube-shaped, are found in confined spaces such as the wrist and ankle.The ribs, shoulder blades, sternum (breastbone), pelvis (hips), and most of the bones of the skull are considered flat bones.