单选题
Why does Sweden have a lower rate of hip implant failure?
A、
Sweden has more advanced technology.
B、
Sweden has a patient data collecting system.
C、
Sweden has a much larger number of patients.
D、
Swedish doctors are more responsible and skilful.
【正确答案】
B
【答案解析】
事实细节题。由第五段第三句可知，瑞典有一种国家关节移植信息数据库，它可以协助医生减少手术失败率，故选B。
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