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
[{'content': 'Which artery is responsible for epistaxis after ligating of external carotid artery? \nSelect and explain. \nA. Ethmoidal artery, B. Greater palatine artery, C. Superior labial artery, D. Ascending pharyngeal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer: (A) Ethmoidal arteryREF: Dhingra 4th ed p. 140Both anterior and posterior ethmoidal arteries are branches from internal carotid artery not external carotid artery', 'role': 'assistant'}]