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': 'All of the following are causes of delayed dentition except \nSelect and explain. \nA. Rickets, B. Hyperparathyroidism, C. Hypothyroidism, D. Cleidocranial dysplasia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Delayed dentition means there is no eruption of teeth by the age of 13 months of age (mean + 35D).\nCauses of delayed dentition:\nRickets\nDown syndrome\nHypothyroidism\nHypoparathyroidism\nCleidocranial dysplasia', 'role': 'assistant'}]