This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
Which of the following is true about Eruption of teeth __________ 
Select and explain. 
A. Premolar appear in Primary dentition, B. Incisors appear first in secondary dentition, C. 3rd molar is last to develop, D. Hypothyroidism delays dentition
B: Incisors appear first in secondary dentition
Answer: B: Incisors appear first in secondary dentition 
Explanation: Eruption times vary from child to child.The first teeth begin to break through the gums at about 6 months of age. Usually, the first two teeth to eruptare the two bottom central incisors (the two bottom front teeth). Next, the top four front teeth emerge. Reference: GHAI Essential pediatrics, 8th edition