This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Pathology
[{'content': 'Most common primary for brain metastasis is which of the following? \nSelect and explain. \nA. Lung cancer, B. Head and neck cancer, C. Prostate cancer, D. Breast cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]