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
Which of the following is not true regarding Gleason grading and scoring? 
Select and explain. 
A. It is used in prostate cancer, B. Prostate specific antigen has score of 3, C. It has score from 2 to 10, D. It is a prognostic scoring system
B: Prostate specific antigen has score of 3
Answer: B: Prostate specific antigen has score of 3 
Explanation: It is pathological scoring system based on tumor morphology. Doesn't include PSA values