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': "Acute leukemia in children is associated with – all except – \nSelect and explain. \nA. Down's syndrome, B. Klinefelter's syndrome, C. Marfan's syndrome, D. Turner's syndrome", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]