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 Acute Lymphoblastic Leukemia, except: \nSelect and explain. \nA. Hyperdiploidy, B. Female sex, C. Pre B cell ALL, D. t (12 : 21) translocation', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hyperdiploidy, Female sex and pre B cell ALL are associated with good prognosis. t (12 : 21) translocation may be associated with a poor prognosis and is the single answer of exclusion. Ref: Pediatric Oncology: A Comprehensive Guide By Paul Imbach, Thomas R. Kuhne, Robe Arceci, 2004, page 23.', 'role': 'assistant'}]