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: Surgery
[{'content': 'The plunging ranula is so called because of \nSelect and explain. \nA. Its size, B. Lifting of tongue, C. Extension through mylohyoid, D. Involvement of lingual nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]