题目内容：
龋齿俗称蛀牙、虫牙，是最常见的口腔疾病，主要是由（）所致的牙齿硬组织脱钙和有机质分解导致的牙齿破坏、崩解的一种感染性疾病。
A.变形链球菌
B.念珠菌
C.葡萄球菌
D.放线菌
参考答案：
选择题：龋齿俗称蛀牙、虫牙，是最常见的口腔疾病，主要是由（）所致的牙齿硬组织脱钙和有机质分解导致的牙齿破坏、崩解的一种感染性疾病
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