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': 'Medial wall of orbit formed by: \nSelect and explain. \nA. Body of sphenoid, B. Lesser wing of sphenoid, C. Greater wing of sphenoid, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e., Body of sphenoid', 'role': 'assistant'}]