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: ENT
[{'content': 'Structure injured during excision of Ranula \nSelect and explain. \nA. parotid duct, B. Facial artery, C. Submandibular duct, D. Lingual nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]