This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Blood supply of the Eustachian tube is by all except - \nSelect and explain. \nA. Ascending pharyngeal aery, B. Middle meningeal aery, C. Aery of pterygoid canal, D. Facial aery', 'role': 'user'}, {'content': "Answer: D \nExplanation: The facial aery is the chief aery of the face. It is a branch of the external carotid aery. The facial aery is very touous. The touosity of the aery prevents its walls from being unduly stretched during movements of the mandible, the lips and the cheeks. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.", 'role': 'assistant'}]