This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "Gleason's grading system is for ? \nSelect and explain. \nA. Carcinoma testis, B. Carcinoma colon, C. Carcinoma thyroid, D. Carcinoma prostate", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `d' i.e., Carcinoma prostateThe Gleason Grading system is used to help evaluate the prognosis of men with prostate cancer.", 'role': 'assistant'}]