This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
Commonest cancer in which metastasis is seen in the brain is - 
Select and explain. 
A. Breast, B. Lung, C. Kidney, D. Intestines
B: Lung
Answer: B: Lung 
Explanation: Lung cancer(commonest metastasis to brain) and melanomas are most likely to present with multiple metastasis, whereas breast, colon, and renal cancers are more likely to present with a single metastasis. Ref Harrison 20th edition pg 539