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: Pathology
[{'content': 'A cyst occurs under the tongue, caused by obstruction of a salivary gland, called as: \nSelect and explain. \nA. Mucocele., B. Ranula., C. Dermoid cyst., D. Dentigerous cyst.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]