<prompt> Most common primary for brain metastasis is which of the following?Lung cancerHead and neck cancerProstate cancerBreast cancer  <response>: Most common Primary for brain metastasis is - LUNG CANCER Paicular Lung cancer which is notorious for causing CNS metastasis - SMALL CELL LUNG CARCINOMA Most common Primary malignant CNS tumor seen in children - MEDULLOBLASTOMA Most common Primary malignant CNS tumor seen in adults - GLIOBLASTOMA Most common Primary benign CNS tumor seen in adults - MENINGIOMA 