218.The appearance of streptococcus mutans in pit and fissure caries is usually followed by caries

a.6 to 10 months later
b.2 to 6 months later
c.within 2 months
d.6 to 24 months later


Ans.d.6 to 24 months later


Explanation:Ref sturdevant 4 th ed/pg 83