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 headquarters of Southeast Asia is at: \nSelect and explain. \nA. New Delhi, B. Ceylon, C. Katmandu, D. Islamabad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HEADQUARTERS\n\nAfrican region - Brazzaville, Congo\nRegion of the Americas -\xa0 Washington D.C, USA\nSoutheast Asia Region -\xa0 New Delhi, India\nEuropean Region - Copenhagen, Denmark\nEastern Mediterranean Region - Cairo, Egypt\nWestern Pacific Region - Manila, Philippines\n\nEssentials of preventive and community dentistry\xa0\nSoben Peter\xa0\n5th edition', 'role': 'assistant'}]