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
Which of the following is the most common tumour associated with neurofibromatosis in a child? 
Select and explain. 
A. Juvenile myelomonocytic leukemia, B. Acute lymphoblastic leukemia, C. Acute monocytic leukemia, D. Acute myeloid leukemiac
B: Acute lymphoblastic leukemia
Answer: B: Acute lymphoblastic leukemia 
Explanation: 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