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
[{'content': 'Bloom Richardson grading - \nSelect and explain. \nA. Carcinoma breast, B. Carcinoma lung, C. Carcinoma prostate, D. Cercinoma ovary', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Carcinoma breasto Bloom Richardson Grading and its variants are used to grade breast cancers.", 'role': 'assistant'}]