This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Most common cause of brain metastases 
Select and explain. 
A. Lung, B. Liver, C. Breast, D. Melanoma
A: Lung
Answer: A: Lung 
Explanation: Origin PercentageLung 40Breast 15Melanoma 10Renal/genitourinary 10Other/unknown 25Ref: Bailey and love 27e pg: 664