You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is WHO headquarters of Southeast Asia is at: and explain in detail?
HEADQUARTERS

African region - Brazzaville, Congo
Region of the Americas -  Washington D.C, USA
Southeast Asia Region -  New Delhi, India
European Region - Copenhagen, Denmark
Eastern Mediterranean Region - Cairo, Egypt
Western Pacific Region - Manila, Philippines

Essentials of preventive and community dentistry 
Soben Peter 
5th edition