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
Which aery does not contribute to little's area: 
Select and explain. 
A. Anterior ethmoidal aery, B. Septalbrach of facial aery, C. Sphenopalatine aery, D. Posterior ethmoidal aery
D: Posterior ethmoidal aery
Answer: D: Posterior ethmoidal aery 
Explanation: Little's area-Anteroinferior pa of nasal septum- formed by- anterior ethmoidal aery,septal branch of superior labial aery,septal brach of sphenopalatine aery,greater palatine aery. Ref.Dhingra 6/e,p 176.