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': 'Blow out fracture of orbit most commonly leads to fracture of: \nSelect and explain. \nA. Lateral wall, B. Roof of orbit, C. Medial wall of orbit, D. Posterior-medial wall of floor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Posterior-medial wall of floor', 'role': 'assistant'}]