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: Medicine
[{'content': 'Which of these is true regarding CML – \nSelect and explain. \nA. Size of splenomegaly indicates prognosis, B. Phagocytic activity of WBC is reduced, C. Sudan black stain is specific for myeloblast, D. Myeloblast, granuloblast and lymphoblast become PH chromosome +ve, –ve following remission', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]