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: Surgery
Commonest orbital tumour causing exophthalmos is ? 
Select and explain. 
A. Glioma, B. Meningioma, C. Hemangioma, D. Neuroblastoma
A: Glioma
Answer: A: Glioma 
Explanation: Ans. is 'a' i.e., Glioma