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
All of the following blood vessels are a part of Kiesselbachfs plexus except- 
Select and explain. 
A. Anterior Ethmoidal artery, B. Posterior ethmoidal artery, C. Greater palatine artery, D. Superior labial artery
B: Posterior ethmoidal artery
Answer: B: Posterior ethmoidal artery 
Explanation: Ans. is 'b' i.e., Posterior ethmoidal artery o Four arteries contribute to little's area:# Anterior ethmoidal artery# Septal branch of superior labial artery (Branch of facial A).# Septal branch of sphenopalatine artery (Branch of maxillary A).# Greater palatine artery (Branch of maxillary A).o These arteries anastomose to form a vascular plexus called "Kiesselbach's plexus".