This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epistaxis, Subject name: ENT
In case of uncontrolled epistaxis ligation of internal maxillary artery is to be done in the: 
Select and explain. 
A. Maxillary antrum, B. Pterygopalatine fossa, C. In the neck, D. Medial wall of orbit
B: Pterygopalatine fossa
Answer: B: Pterygopalatine fossa 
Explanation: (b) Pterygopalatine fossa(Ref. Scott Brown, 8th ed., Vol 1; 1178)The maxillary artery which is also called internal maxillary artery along with sphenopalatine and greater palatine artery lies in the sphenopalatine/ pterygopalatine fossa just behind the posterior wall of maxillary antrum.In uncontrolled epistaxis ligation of internal maxillary artery is to be done in the sphenopalatine fossa via Caldwell-Luc operation.