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': 'A blow out fracture of orbit refers to a fracture in: \nSelect and explain. \nA. Roof of the orbit, B. Posterior wall of floor of orbit, C. Medial wall of orbit, D. Medial pa of floor of orbit', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Medial pa of floor of orbit', 'role': 'assistant'}]