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': 'Thinnest wall of the orbit is: \nSelect and explain. \nA. Medial wall, B. Floor, C. Roof, D. Lateral wall', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Medial wall', 'role': 'assistant'}]