This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
[{'content': 'All of the following are associated with good prognosis in childhood leukemia except: \nSelect and explain. \nA. Hyperdiploidy, B. Female sex, C. Precursor B-cell ALL, D. t(12; 21) translocation', 'role': 'user'}, {'content': "Answer: C \nExplanation: c. Precursor B-cell ALL(Ref: Nelson's 20/e p 2437, Ghai 8/e p 599)Precursor B-cell ALL, B-cell ALL and T-cell ALL has poor prognosis.", 'role': 'assistant'}]