This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
Enophthalmos caused by fracture of - 
Select and explain. 
A. Floor of orbit, B. Medial wall of orbit, C. Lateral wall of orbit, D. Roof of orbit
A: Floor of orbit
Answer: A: Floor of orbit 
Explanation: It is seen in Orbital blowout fractures where orbital floor is fractured. 3 factors responsible for enopthalmos : Escape of Orbital fat into maxillary sinus. Backward traction on the globe by entrapped inferior rectus muscle. Enlargement of orbital cavity from displacement of fragments. Ref: AK Khurana 6thE pg423