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 maximum contribution to the floor of the orbit is by - \nSelect and explain. \nA. Maxilla, B. Sphenoid, C. Palatine, D. Zygomatic', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The orbital floor is mainly formed by the orbital surface of the maxilla.\nOther contributions are:-\n\n\nThe lower part of the orbital surface of the zygomatic bone, anterolaterally.\nThe orbital process of palatine bone at the posterior angle.', 'role': 'assistant'}]