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': 'In a government policy to achieve Millennium Development Goal 4; it was decided to immunize 90% of the children to reduce IMR to 30. ‘The reduction of IMR to 30’ is: \nSelect and explain. \nA. Target, B. Objective, C. Goal, D. Mission', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]