Correct option is A
The correct meaning of the word “epidemic” is (a) A large number of people or animals suffering from the same disease at the same time.
Epidemic: A widespread occurrence of an infectious disease in a community at a particular time. (महामारी)
Example: The flu epidemic spread quickly in the town.
Meanings of other options:
· (b) Virus-specific, not general
· (c) “Spreads slowly” refers more to endemic
· (d) “Lasts for more than fifty years” — refers to chronic disease, not epidemic