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': 'Glue Ear shows \nSelect and explain. \nA. Cart wheel appearance of Tympanic membrane, B. Blue Tympanic membrane with Air bubbles, C. Purulent discharge, D. Painful Ear', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]