This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of orbit, Lids and lacrimal apparatus, Subject name: Ophthalmology
[{'content': 'Enophthalmos caused by fracture of- \nSelect and explain. \nA. Floor of orbit, B. Medial wall of orbit, C. Lateral wall of orbit, D. Roof of orbit', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Post traumatic enophthalmos is caused by blow out fracture trough the floor of orbit. Ref: Khurana 7th/e p.424', 'role': 'assistant'}]