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 WHO theme for 1996-97 is \nSelect and explain. \nA. Oral health, B. Cities, C. Polio, D. Cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]