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: ENT
Which of the following aery is not involved in the formation of Kiesselbach's plexus? 
Select and explain. 
A. Anterior ethmoidal aery, B. Posterior ethmoidal aery, C. Greater palatine aery, D. Sphenopalatine aery
B: Posterior ethmoidal aery
Answer: B: Posterior ethmoidal aery 
Explanation: Kiesselbach's area or Little's area, is a region in the anteroinferior pa of the nasal septum, where four aeries anastomose to form a vascular plexus called Kiesselbach's plexus. The aeries which forms the plexus are: ? Anterior ethmoidal aery (from the ophthalmic aery) ? Sphenopalatine aery (from the maxillary aery) ? Greater palatine aery (from the maxillary aery) ? Septal branch of the superior labial aery (from the facial aery)