This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Which of the following is the most common tumour associated with neurofibromatosis in a child? \nSelect and explain. \nA. Juvenile myelomonocytic leukemia, B. Acute lymphoblastic leukemia, C. Acute monocytic leukemia, D. Acute myeloid leukemiac', 'role': 'user'}, {'content': "Answer: B \nExplanation: Juvenile myelomonocytic leukemia(JMML) is a rare childhood cancer. It happens when immature blood cells (called blasts) make too many myelocytes and monocytes (two types of white blood cells). Ref ganong's review of medical physiology 25e p765", 'role': 'assistant'}]