This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chronic Myelogenous Leukemia, Subject name: Pathology
[{'content': 'All of the following are true regarding chronic myeloid leukemia, except? \nSelect and explain. \nA. Philadelphia chromosome, B. Tyrosine kinase inhibitors (TKIs) are the drug of choice, C. Most cases present in blast phase, D. Sea-blue histiocytes are seen in the bone marrow', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Chronic myeloid leukemia Most common myeloproliferative neoplasm Caused by reciprocal translocation between between long arms of chr 9 & 22 giving rise to shoened chromosome 22 which is referred to as Philadelphia chromosome (Ph chromosome). Most cases present in chronic phase Patient present with hyperleucocytosis, massive splenomegaly Bone marrow is hypercellular with granulocytic hyperplasia. Sea-blue histiocytes can be seen. After a variable period, some patients may transform to accelerated phase or blast crisis. Tyrosine kinase inhibitors are the drug of choice, eg. Imatinib, Dasatinib, etc.', 'role': 'assistant'}]