This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Subject name: Pediatrics
[{'content': 'Delayed dentition is usually considered when there are no teeth by the age of? \nSelect and explain. \nA. 18 months, B. 9 months, C. 16 months, D. 13 months', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Delayed dentition is usually considered when there are no teeth has erupted by the age of 13 months Normally temporary teeth eruption is completed by 2 to 2.5yr of age', 'role': 'assistant'}]