【名词&注释】
临床表现(clinical manifestation)、城乡居民(urban and rural residents)、有机酸(organic acid)、宣传教育(propaganda and education)、文化程度(education level)、知识点(knowledge point)、建立健全(establishing and perfecting)、艾滋病防治(aids prevention and control)、畸形中央尖(deformity central portion canine teeth)、釉质发育不全(enamel hypoplasia)
[单选题]前磨牙
A. 氟斑牙
B. 先天梅毒牙
C. 畸形舌侧窝
D. 畸形中央尖(deformity central portion canine teeth)
E. 釉质发育不全(enamel hypoplasia)