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
Imatinib mesylate is most useful in the treatment of- 
Select and explain. 
A. Chronic lymphoid leukaemia, B. Chronic myeloid leukaemia, C. Acute myeloid leukaemia, D. Acute lymphoid leukaemia
B: Chronic myeloid leukaemia
Answer: B: Chronic myeloid leukaemia 
Explanation: None