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
[{'content': 'Which of the following carcinoma most frequently metastasize to brain \nSelect and explain. \nA. Small cell carcinoma of lung, B. Prostate cancer, C. Rectal cancer, D. Endometrial cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]