This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
[{'content': 'Most common site of Brain metastasis is? \nSelect and explain. \nA. Lung cancer, B. Head and neck cancer, C. Prostate cancer, D. Breast cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref: Bailey and Love 26th edition, P 614The leading cause of brain metastasis is lungs > Breast>MelanomaTissue of origin for brain metastases (approximate).OriginPercentageLung40Breast15Melanoma10Renal/GU10Other Unknown25', 'role': 'assistant'}]