This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Not a component of Kiesselbach's plexus: 
Select and explain. 
A. Superior labial artery, B. Posterior ethmoidal, C. Sphenopalatine, D. Greater palatine
B: Posterior ethmoidal
Answer: B: Posterior ethmoidal 
Explanation: Ans-B Ref: Diseases of the Ear, Nose, and Throat by PL Dhingra 5th edn .2010.page 190 Explanation: Kiesselbach's plexus is situated in the Little's area which is the anterior inferior part of the septum Arteries forming the Kiesselbach's Plexus Anterior ethmoidal artery Septal branch of the superior labial artery Greater palatine artery Sphenopalatine arteries artery (See figure on the next page)