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: Anatomy
[{'content': 'Scutum is present in middle ear ? \nSelect and explain. \nA. Roof, B. Lateral wall, C. Medial wall, D. Floor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lateral wall', 'role': 'assistant'}]