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 10 year old female patient diagnosed as a case of\ndown's syndrome having mosaicism variety.\n\nFollowing\tdental\tproblem\tare\tusually in association\nwith it, except \nSelect and explain. \nA. Retarded eruption, B. Late shedding of deciduous teeth, C. Hypodontia, D. Microdontia", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]