This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'The duct(s) of gland(s) opening into the floor of the mouth is (are): \nSelect and explain. \nA. Submandibular and sublingual, B. Submandibular and parotid, C. Sublingual and parotid, D. Von Ebner', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]