Explanation:

The World Health Organization (WHO) is a specialized agency of the United Nations that is concerned with international public health. It was established on 7 April 1948, and is headquartered in Geneva, Switzerland. The WHO is a member of the United Nations Development Group. Its predecessor, the Health Organisation, was an agency of the League of Nations.India became a party to the WHO Constitution on 12 January 1948

The constitution of the World Health Organization had been signed by 61 countries on 22 July 1946, with the first meeting of the World Health Assembly finishing on 22 July 1946. It incorporated the Office International d'Hygiène Publique and the League of Nations Health Organization. Since its establishment, it has played a leading role in the eradication of smallpox. Its current priorities include communicable diseases, in particular HIV/AIDS, Ebola, malaria and tuberculosis; the mitigation of the effects of non-communicable diseases such as sexual and reproductive health, development, and aging; nutrition, food security and healthy eating; occupational health; substance abuse; and driving the development of reporting, publications, and networking.

The WHO is responsible for the World Health Report, the worldwide World Health Survey, and World Health Day. The current Director-General of the WHO is Tedros Adhanom, who started his five-year term on 1 July 2017.