This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
"Blow out" Fracture of orbit involve- 
Select and explain. 
A. Floor, B. Medial wall, C. Lateral wall, D. Roof
A: Floor
Answer: A: Floor 
Explanation: * "The Most common site for a blowout fracture to occur is the posteromedial aspect of the orbital floor, medial to the Infraorbital neurovascular bundle where the maxillary bone is very thin". Ref:Clinical ophthalmology 5th/e p.1129