A. Virus
B. Vaccine
C. Lockdown
D. Covid
Explanation:
‘Vaccine’ is the word of the year 2021of Merriam-Webster, America’s most trusted online dictionary.
The terms vaccine & vaccination are derived from Variolae vaccinae (smallpox of the cow), the term devised by Edward Jenner & he coined the word vaccine from the Latin word ‘vacca’ for cow.