This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
Bloom Richardson grading - 
Select and explain. 
A. Carcinoma breast, B. Carcinoma lung, C. Carcinoma prostate, D. Cercinoma ovary
A: Carcinoma breast
Answer: A: Carcinoma breast 
Explanation: Ans. is 'a' i.e., Carcinoma breasto Bloom Richardson Grading and its variants are used to grade breast cancers.