This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors of Nervous System, Subject name: Medicine
Most common brain tumor? 
Select and explain. 
A. Astrocytoma, B. Oligodendroglioma, C. Ependymoma, D. Medulloblastoma
A: Astrocytoma
Answer: A: Astrocytoma 
Explanation: Ans. (a) AstrocytomaRef: Harrison 19th ed. / 599-600* Most malignant brain tumor is Glioma( subtype - astrocytoma)* Most common brain tumor is metastasis to brain ( oat cell cancer/breast cancer /malignant melanoma)* Most common benign brain tumor is Meningioma* OC for brain tumor is gadolinium enhanced MRI