This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'True about dentition – \nSelect and explain. \nA. Hypothyroidism causes delayed dentition, B. Premolar is not seen in primary dentition, C. 3rd  molar is the last to appear in secondary dentition, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]