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: Anatomy
[{'content': 'A 64 year old man, has had recurring nasal hemorrhages following surgery to remove nasal polyps. To control the bleeding, the surgeon is considering ligating the primary aerial supply to the nasal mucosa. This aery is a direct branch of which of the following aeries? \nSelect and explain. \nA. Facial aery, B. Maxillary aery, C. Superficial temporal aery, D. Superior labial aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The major source of blood supply to the nasal mucosa is the sphenopalatine aery, which is the terminal branch of the maxillary aery. The sphenopalatine aery enters the nasal cavity from the pterygopalatine fossa by passing through the sphenopalatine foramen in the lateral wall of the nasal cavity.', 'role': 'assistant'}]