Central incisors appear at:

Correct option is B

Ans. (b) 6th month
Sol. The lower central incisors are usually the first teeth to erupt, typically appearing around the 6th month of age.
Explanation of each option:
· (a) 4th month – Too early for most infants; tooth buds are still developing.
· (b) 6th month – Correct. Most infants start teething at this age.
· (c) 10th month – Lateral incisors and other teeth usually erupt by this time.
· (d) 12th month – Molars or upper incisors may erupt around this time, not central incisors.