the question and answer cannot be done using CMS.
you would need to create a table of questions
questionID - primary key
and a table of answers:
answerID - Primary key
answerQuestionID - relates to questions.questionID
isCorrect - 0 or 1 (1 for correct)
the checkboxes will pass the answerID, and be used to look up the selected answer i n a recordset.
if the isCorrect column is 1, the answer is correct, use this to trigger the message.
you can use data asssit pages to manage the questions and answers.