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: Ophthalmology
[{'content': 'The angle between medial wall and lateral wall of orbital cavity is \nSelect and explain. \nA. 0°, B. 45°, C. 90°, D. 60°', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The angle between medial wall and lateral wall of orbital cavity is 45°.', 'role': 'assistant'}]