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
[{'content': 'How many teeth are present in 3 year old ___________ \nSelect and explain. \nA. 8 teeth, B. 12 teeth, C. 18 teeth, D. 20 teeth', 'role': 'user'}, {'content': 'Answer: D \nExplanation: After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primaryteeth, baby teeth, or milk teeth and there are 20 in all. When a child gets to age 5 or 6, these teeth sta falling out, one by one. Ref : Nelson paediatrics Chapter : Growth and de', 'role': 'assistant'}]