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
[{'content': "Gene instability associated with malignancy in - \nSelect and explain. \nA. Klippel field syndrome, B. Ataxia telangiectasia, C. Marfan's syndrome, D. Sickle cell disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Ataxia telangiectasia', 'role': 'assistant'}]