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': 'The most common tumour that spreads into the orbit from the intracranial cavity is: \nSelect and explain. \nA. Astrocytoma, B. Pituitary adenoma, C. Sphenoid wing-meningioma, D. Neurofibroma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Sphenoid wing-meningioma', 'role': 'assistant'}]