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
All are associated with malignancy except- 
Select and explain. 
A. Down's syndrome, B. Fragile X syndrome, C. Bloom syndrome, D. Fanconi 's anaemia
B: Fragile X syndrome
Answer: B: Fragile X syndrome 
Explanation: Ans. is 'b' i.e., Fragile X-syndrome Has been explained (see factors predisposing to childhood leukemia).