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': 'True statements about parotid gland \nSelect and explain. \nA. Duct opens oppsite to upper 2nd molar tooth, B. Duct pierces Masseter, C. Develops from ectoderm, D. Secretomotor fibres come from facial nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The duct runs forwards for a sho distance between the buccinator and the oral mucosa. Finally, the duct turns medically and opens into the vestibule of the mouth(gingivobuccal vestibule)opposite the crown of the upper second molar tooth. Notes: Parotid abscess may be caused by spread of infection from the opening of parotid duct in the mouth cavity. <img src=" /> REF.BDC VOL.3,Sixth edition pg 110', 'role': 'assistant'}]