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: Anatomy
[{'content': 'The orbital opening is somewhat \nSelect and explain. \nA. Quadrangular, B. Oval, C. Oblong, D. Circular', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The orbit\xa0appears as quadrangular pyramid in shape, i.e. Resembles a four-sided pyramid, which has an apex, base, four walls - roof, floor, medial and lateral walls.', 'role': 'assistant'}]