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: Pathology
[{'content': 'Which of the following is not compatible with a diagnosis of juvenile myelomonocytic leukemia? \nSelect and explain. \nA. Peripheral blood monocytosis, more than 1 x 107L, B. Increased Hemoglobin F levels for age, C. Presence of bcr/abl fusion gene, D. GM - CSF hypersensitivity of myeloid progenitors in vitro', 'role': 'user'}, {'content': 'Answer: C \nExplanation: . Presence of bcr/abl fusion gene', 'role': 'assistant'}]