This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
A patient presents with enophthalmos after a trauma to face by blunt object. There is no fever or extraocular muscle palsy. Diagnosis is 
Select and explain. 
A. Fracture maxilla, B. Fracture zygoma, C. Blowout fracture, D. Fracture ethmoid
C: Blowout fracture
Answer: C: Blowout fracture 
Explanation: Due to a trauma to face by a blunt object, an increased pressure may rupture the floor of the orbit and extrude the fat content of orbit, resulting in enophthalmos. Thus it is due to a &;blow-out fracture&; or fracture of orbital floor Ref: Diseases of nose throat and ear; Logan Turner; 10th edition; pg no 27