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Storky87

This plugin adds a question and answer page in WordPress. 
They can be displayed either list or divided into categories. 
Display all the questions on the page, or each question will have its own page with the answer.

WP Question & Answer

Adds a question and answer page in WordPress.

binnyva

Quizzin lets you create quizzes with any number of questions in it. Each question can have many answers – in which one should be marked as the correct answer.
You can add the quiz in a post by including the html comment [QUIZZIN 1] in the post. Here 1 is the ID of the quiz to be included.

Quizzin

Quizzin lets you add quizzes to your blog. This plugin is designed to be as easy to use as possible. Quizzes, questions and answers can be added from  …

WP Question & Answer vs Quizzin