This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Which of the following carcinoma most frequently metastasize to brain 
Select and explain. 
A. Small cell carcinoma of lung, B. Prostate cancer, C. Rectal cancer, D. Endometrial cancer
A: Small cell carcinoma of lung
Answer: A: Small cell carcinoma of lung 
Explanation: Ref Harrison 17/e p2458; Robbins 8/e p1339;7/e p1410;9/e p1315 Small cell carcinoma of lung most commonly metastasize to brain.it account for about 40% of brain metastasis Other tumors metastasizing to brain are carcinomas of .breast .melanoma .kidney .GIT