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: Pathology
Gene instability associated with malignancy in - 
Select and explain. 
A. Klippel field syndrome, B. Ataxia telangiectasia, C. Marfan's syndrome, D. Sickle cell disease
B: Ataxia telangiectasia
Answer: B: Ataxia telangiectasia 
Explanation: . Ataxia telangiectasia