Following a massive global immunization effort, the World Health Organization officially declared the total eradication of smallpox in which year?
Q1. Following a massive global immunization effort, the World Health Organization officially declared the total eradication of smallpox in which year?
Answer: 1980
Explanation: Smallpox was officially declared eradicated by the WHO in 1980; 1990 is too late as the last case occurred in 1977.