This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
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: D i.e. Posterior-medial wall of floor