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: Pediatrics
[{'content': 'All of the following are good prognostic factors for childhood. All except – \nSelect and explain. \nA. Hyperdiploidy, B. Female sex, C. Pre B cell ALL, D. t (12 : 21) translocation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pre B cell ALL has poor prognosis.', 'role': 'assistant'}]