Question: A 64-year-old male presents to the emergency room with a bloody nose that has been dripping out his nares for the past 2 hours. He denies any trauma, recent upper respiratory illness, or history of prior bloody nose. Past medical history is unremarkable, and he takes no medications. He has a blood pressure of 180/90 mmHg. Examination of the nasal passages reveals that the site of the bleeding is on the septal mucosa of the right naris. The most likely site of origin of this patient's epistaxis is
A: anterior turbinate
B: ethmoid sinus
C: Kiesselbach plexus
D: posterior nasal pharynx
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. Write exactly 3 paragraphs each separated with two new lines answering this question. The last paragraph must start with "assistance".
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