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': 'Delayed dentition is seen in ____________ \nSelect and explain. \nA. Down syndrome, B. Congenital hypothyroidism, C. Rickets, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .Abnormalities in tooth eruption (timing and sequence) is often caused by genetics and may result in malocclusion. In severe cases, such as in Down syndrome,congenital hypothyroidism & rickets , the eruption may be delayed by several years and some teeth may never erupt Reference: GHAI Essential pediatrics, 8th', 'role': 'assistant'}]