This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Blow out fracture of orbit most commonly leads to fracture of 
Select and explain. 
A. Lateral wall, B. Roof of orbit, C. Medial wall of orbit, D. Posterior-medial wall of floor
D: Posterior-medial wall of floor
Answer: D: Posterior-medial wall of floor 
Explanation: This fracture usually occurs where the bone is thinnest, along with the paper-thin floor of the orbit over the maxillary sinus. The ring-shaped bony orbital rim usually remains intact. The fracture can result in protrusion and impingement of orbital fat and the inferior rectus and its sheaths in the fracture gap.