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
Woodruff's plexus is located at 
Select and explain. 
A. Anterosuperior pa of nose, B. Anteroinferior pa of nose, C. Posteroinferior pa of nose, D. Posterosuperior pa of nose
C: Posteroinferior pa of nose
Answer: C: Posteroinferior pa of nose 
Explanation: O Woodruff's plexus (also called nasopharyngeal plexus) is a confluence of vessels on the lateral wall of nose and is often implicated in 'posterior' bleeds. O It is a venous plexus situated posterior to posterior end of Middle and inferior turbinate. In recent histological studies it is found to consist of thin walled vessels with very little muscle or fibrous tissue. O It is the most common site of posterior epistaxis in adults. A more recent study with endoscopic photography and anatomical micro-dissectionconfirmed that the plexus does indeed exist but showedit to be a venous plexus.