This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Injuries and Abnormalities, Subject name: Surgery
A 72-year-old man presents to the emergency depament complaining of frequent nose-bleeds. What is the most likely site of acute epistaxis? 
Select and explain. 
A. Turbinate, B. Septum, C. Maxillary sinus, D. Ethmoid sinus
B: Septum
Answer: B: Septum 
Explanation: The most common source of epistaxis is Kisselbach's vascular plexus on the anterior nasal septum. Predisposing factors include foreign bodies, forceful nose-blowing, nose-picking, rhinitis and deted septum