This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Complications of sphenoid sinus surgery are all except: 
Select and explain. 
A. CSF leak, B. Optic nerve injury, C. Lateral rectus palsy, D. Orbital emphysema
D: Orbital emphysema
Answer: D: Orbital emphysema 
Explanation: (d) Orbital emphysema(Ref. Cummings, 6th ed., 778)Orbital complications will follow maxillary, ethmoid and frontal sinus surgeries due to close proximity.