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
Most severe complication of maxillary sinus lavage and insufflation- 
Select and explain. 
A. Facial nerve injury, B. Air embolism, C. Epistaxis, D. Coagulopathy
B: Air embolism
Answer: B: Air embolism 
Explanation: Ans. is 'b' i.e., Air embolism Complication of Maxillary sinus lavage and insufflationo Complications of nonendoscopic drainage procedures can be minor or severe.o The most common complication is failure to enter the sinus because of improper positioning of the trocar, incomplete penetration of the sinus mucosa, or the presence of a hypoplastic antrumo Epistaxis may occur because of laceration of the nasal mucosa or preexisting coagulopathies necessitating packingo Severe complications include orbital injury, air embolism, and death secondary to injection of air into the sinus.