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: Surgery
A 20 year old man is hit on the eye with a ball. On examination there is restriction of lateral and upward gaze and diplopia. There is no obvious visible sign of injury to the eye ball, but there is some enophthalmos, the likely diagonosis is - 
Select and explain. 
A. Zygoma fracture, B. Maxillary fracture, C. Blow out fracture of the orbit, D. Injury to lateral rectus
C: Blow out fracture of the orbit
Answer: C: Blow out fracture of the orbit 
Explanation: None