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 the orbit, most commonly leads to fracture of - 
Select and explain. 
A. Posteromedial floor of orbit, B. Medial wall of orbit, C. Lateral wall of orbit, D. Roof of orbit
A: Posteromedial floor of orbit
Answer: A: Posteromedial floor of orbit 
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." - The Internet Journal of Otorhinolaryngology.