This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
[{'content': 'Gleason score: all are true except \nSelect and explain. \nA. Used for grading prostate cancer, B. Scores range from 1-10, C. Higher the score, poorer the prognosis, D. Helps in planning management', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The Gleason grading system is used to help evaluate the prognosis of men with prostate cancer using samples from a prostate biopsy. Together with other parameters, it is incorporated into a strategy of prostate cancer staging which predicts prognosis and helps guide therapy. A Gleason score is given to prostate cancer based upon its microscopic appearance. Cancers with a higher Gleason score are more aggressive and have a worse prognosis. Pathological scores range from 1 through 10, with higher the number, indicating greater risks and higher the moality. A total score is calculated based on how cells look under a microscope, with half the score based on the appearance of the most common cell morphology (scored 1--5), and the other half based off the appearance of the second most common cell morphology (scored 1--5). These two numbers are then combined to produce a total score for the cancer.', 'role': 'assistant'}]