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': 'WHO theme for 2019: \nSelect and explain. \nA. Universal coverage: Everyone, Everywhere., B. Depression, lets talk., C. Good health adds life to years., D. Working together for health.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]