This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': 'Prophylactic intracranial radiation is given to \nSelect and explain. \nA. Small cell carcinoma, B. Testicular carcinoma, C. Breast carcinoma, D. Gastric carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Ref: doi:10.1634/theoncologist.5-4-293The Oncologist August 2000vol. 5 no. 4 293-298; Prophylactic Cranial Irradiation in Small-Cell Lung Cancer)', 'role': 'assistant'}]