protagonis vs. antagonis

[Literature guy]

English Language Tests, Intermediate level

ESL/EFL Test #272 "Literary Terms (4)", question 8

The ......... is the main character in a story, play etc.

(a) antagonist
(b) protagonist
(c) humorist

English Language Tests, Intermediate level

ESL/EFL Test #272 "Literary Terms (4)", answer 8

The protagonist is the main character in a story, play etc.

Correct answer: (b) protagonist

Your answer was: incorrect
The antagonist is the main character in a story, play etc.
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can you explan in clear, I can not understand best

Literature guy

[Mister Micawber]

.
Protagonist: the principal character in a work of fiction
Antagonist: the adversary of the hero or protagonist of a drama or other literary work.
.
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Native English teacher at Mister Micawber's