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': "The 'd' in 'clef' stands for \nSelect and explain. \nA. All primary decayed teeth which require silver fillings, B. All decayed primary teeth which require extraction, C. All decayed teeth which require extraction in a 10 year old child, D. All decayed primary anterior teeth", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]