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
If posterior epistaxis cannot be controlled,which aery is kigated 
Select and explain. 
A. posterior Ethmoidal aery, B. Maxillary aery, C. Sphenopalatine aery, D. External carotid aery
C: Sphenopalatine aery
Answer: C: Sphenopalatine aery 
Explanation: ESPAL is the current ligation of choice controlling bleeding in over 90% of cases with a low complication rate. Sphenopalatine aery is ligated in the sphenopalatine foramen. Ref Scott Brown 7/e,Vol 2,p 1606.