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': "All the following structures are pierced by Stenson's duct except \nSelect and explain. \nA. Buccopharyngeal Fascia, B. Pharyngobasilar Fascia, C. Buccal pad of fat, D. Buccinator", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The parotid duct pierces buccal pad of fat, buccopharyngeal fascia, buccinator muscle and the mucous membrane to open into the vestibule of mouth opposite the crown of the upper second molar tooth.Reference: Chourasia; 6th edition; 61 pages', 'role': 'assistant'}]