<prompt> Most common site of Brain metastasis is?Lung cancerHead and neck cancerProstate cancerBreast cancer  <response>: Ref: Bailey and Love 26th edition, P 614The leading cause of brain metastasis is lungs BreastMelanomaTissue of origin for brain metastases approximate.OriginPercentageLung40Breast15Melanoma10RenalGU10Other Unknown25 