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 are associated with malignancy except- \nSelect and explain. \nA. Down's syndrome, B. Fragile X syndrome, C. Bloom syndrome, D. Fanconi 's anaemia", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Fragile X-syndrome Has been explained (see factors predisposing to childhood leukemia).", 'role': 'assistant'}]