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
[{'content': 'Best treatment for glioblastoma multiforme: \nSelect and explain. \nA. Chemotherapy, B. Radiation, C. Excision with radiation, D. Stereotactic surgery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Excision with radiation* These are highly infiltrative tumors, and the areas of increased T2/FLAIR signal surrounding the main tumor mass contain invading tumor cells.* Treatment involves maximal surgical resection followed by partial-field external beam radiotherapy (6000cGy in thirty 200-cGy fractions) with concomitant temozolomide, followed by 6-12 months of adjuvant temozolomide', 'role': 'assistant'}]