<prompt> The most impoant single function of World Health Organization is?Prevention and control of specific diseasesDevelopment of comprehensive health servicesHealth literature InformationBiomedical research  <response>: WHO : Established in 1945. Constitution came into force on 7th April 1948. Hence, 7th April is WORLD HEALTH DAY. Head quaers is located in GENEVA. WHD 2018,2019 Theme is Universal health coverage. WHOs most impoant single function is to promote and suppo national health policy development and the development of comprehensive national health programmes. Other Works of WHO - Prevention and control of specific diseases, Family health, Environment health, Health statistics, Health literature Information, Biomedical research, Cooperation with other organizations. 