题目：
龋最好发于（）。
A.上颌第一磨牙
B.上颌第二磨牙
C.下颌第一磨牙
D.下颌第二磨牙
E.上颌第一磨牙
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
龋最好发于（）。 A.上颌第一磨牙 B.上颌第二磨牙 C.下颌第一磨牙 D.下颌第二
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