This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'True about dentition are all except \nSelect and explain. \nA. Hypothyroidism causes delayed dentition, B. Premolar is not seen in primary dentition, C. Third molar is last to appear in secondary dentition, D. Canine is the first in primary dentition', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The first tooth to erupt in primary dentition is the lower central incisor at 6-10 yrs of age, and in upper jaw at the age of 8-12 yrs. Whilst the canine in primary dentition appears at the age of 16-22 yrs, in the upper jaw. Ref: Ghai, 9th edition, Table 2.2.', 'role': 'assistant'}]