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: Dental
[{'content': "A 3-year-old child presents with only deciduous canine\nand molars. The child has light fine hair, light complexion\nand overall appearance of an older person. The findings\nsuggest: \nSelect and explain. \nA. Cleidocranial dysostosis, B. Osteogenesis imperfecta, C. Crouzan's disease, D. Ectodermal dysplasia", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]