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
Most common site of Brain metastasis is? 
Select and explain. 
A. Lung cancer, B. Head and neck cancer, C. Prostate cancer, D. Breast cancer
A: Lung cancer
Answer: A: Lung cancer 
Explanation: 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