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': "CML in children is associated with : \nSelect and explain. \nA. Down's syndrome, B. Klinefelter's syndrome, C. Marfan's syndrome, D. Turner's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Patients with Down syndrome are more prone to develop juvenile type of CML.', 'role': 'assistant'}]