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': 'Which of the following is poor prognostic factor in a child with ALL ? \nSelect and explain. \nA. Age 2–8 yrs, B. Total leucocyte count < 50,000, C. t (9; 22); t (4;11); t (1;19), D. Absent blasts in peripheral smear', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]