This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular trauma , Subject name: Ophthalmology
[{'content': '"Blow out" Fracture of orbit involve- \nSelect and explain. \nA. Floor, B. Medial wall, C. Lateral wall, D. Roof', 'role': 'user'}, {'content': 'Answer: A \nExplanation: * "The Most common site for a blowout fracture to occur is the posteromedial aspect of the orbital floor, medial to the Infraorbital neurovascular bundle where the maxillary bone is very thin". Ref:Clinical ophthalmology 5th/e p.1129', 'role': 'assistant'}]