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': 'Ranula is a - \nSelect and explain. \nA. Mucous cyst, B. Tumor, C. Submandibular gland swelling, D. Swelling on dorsum of tongue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]