题目：
关于掌跖角化-牙周破坏综合征临床表现描述哪项是错误的（）
A.皮肤和牙周病变多在4岁前共同出现
B.患儿智力障碍但身体发育正常
C.即侵犯乳牙又侵犯恒牙
D.有深牙周袋，牙槽骨吸收迅速
E.本病罕见，人群中患病率约为1／100万～4／100万
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
关于掌跖角化-牙周破坏综合征临床表现描述哪项是错误的（） A.皮肤和牙周病变多在4岁
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