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': 'Which of the following teeth are not excluded from the scoring in Simplified Oral Hygiene Index (OHI-S)? \nSelect and explain. \nA. Natural teeth with full crown restorations, B. Surfaces reduced in height by caries, C. Traumatized teeth, D. Functional third molars', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The Simplified Oral Hygiene Index (OHI-S) was developed in 1964 by John C. Greene and Jack R. Vermillion.\xa0\nNatural teeth with full crown restorations and surfaces reduced in height by caries or trauma are not scored. Third molars are\xa0 included only if they are functional', 'role': 'assistant'}]