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': 'If a patient had 28 teeth and 20% of sites has attachment loss, the number of periodontally involved sites will be \nSelect and explain. \nA. 112, B. 28, C. 20, D. 22', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]