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': 'Volume of orbit is \nSelect and explain. \nA. 19 ml, B. 29 ml, C. 39 ml, D. 49 ml', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. 29 mlVolume of each orbit is 29 ml.Orbit is made up of 7 bones: frontal, ethmoid, lacrimal, palatine, maxilla, zygomatic and sphenoid', 'role': 'assistant'}]