This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pathology
Most common CNS tumor associated with NF-1 is? 
Select and explain. 
A. Optic nerve glioma, B. Meningioma, C. Medulloblastoma, D. Ependymoma
A: Optic nerve glioma
Answer: A: Optic nerve glioma 
Explanation: Ans. is 'a' i.e., Optic nerve glioma * Optic nerve glioma is one of the diagnostic sign of NF-1.