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': 'Parotid duct opens \nSelect and explain. \nA. Opposite 1st mollar, B. Opposite 2nd molar, C. Into the papilla, D. Opposite incisor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The duct runs forwards for a sho distance between the buccinator and the oral mucosa. Finally, the duct turns medially and opens into the vestibule of the mouth opposite to the crown of upper second molar tooth. REF.BDC SIXTH EDITION VOL NO:3 PAGE NO:110', 'role': 'assistant'}]