This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urethra & Penis, Subject name: Surgery
Gleason score is used to grade: 
Select and explain. 
A. Prostate cancer, B. Transitional Cell CA, C. Penile cancer, D. Anal cancer
A: Prostate cancer
Answer: A: Prostate cancer 
Explanation: Ans. (a) Prostate cancerRef: Bailey 27th Edition, Page 1469* Classification of histological pattern based on the degree of glandular de- differentiation and its relation to stroma has been devised by GLEASON.* Prostate cancers exhibits heterogeneity within the tissue itself and hence two histological areas of prostate are scored each between 1- 5.* The scores are added to an overall score of 2- 10.* Gleason score 2- 10 helps to predict the likelihood of spread and prognosis* Example: Gleason Score of 8-10: High Grade tumor, Poor Prognosis