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
[{'content': 'Source of epistaxis after ligation of external carotid aery is: \nSelect and explain. \nA. Maxillary aery, B. Greater palatine aery, C. Superior labial aery, D. Ethmoidal aery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, B and C are branches of external carotid aery. If external carotid aery is ligated,the source of epistaxis will be Ethmoidal aery which is a branch of internal carotid aery. Ref Dhingra 6/e,p 178.', 'role': 'assistant'}]