help setting questions and answers in quiz game?

[buran]

I do have a question though, in your given code, on line 8, what does the i%2 do? I am trying to figure that out to myself but I can't come to a conclusion. Is it asking if each line is an even number?

% is modulo operator. The result is the remainder of the division. So, yes, in this case i%2 checks for odd/even number. Remember indexing (thus also enumerate) starts from 0. So if there is no reminder - it's a question (index is 0, 2, 4, etc.) and if there is reminder - it's answer (index is 1, 3, 5, etc.). Also remember that non-zero numbers are evaluated as True.

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using [the same] index is the most primitive/naive way to link question and answer. Not very pythonic though. Also note my use of enumerate, no need to use/increase index yourself.
more pythonic would be to zip the questions and answers list and get 2-element tuple:

class Quiz:
    def __init__(self, quiz_file):
        self.quiz_file = quiz_file
        self.questions = []
        self.answers = []
        with open(self.quiz_file, 'r') as f:
            for i, line in enumerate(f):
                if i%2: # this is answer
                    self.answers.append(line.strip())
                else: # this is question
                    self.questions.append(line.strip())
                    
    def list_qa(self):
        for index, question, answer in enumerate(zip(self.questions, self.answers), start=1):
            print('Q{}: {}'.format(index, question))
            print('A{}: {}'.format(index, answer))
            print()

I will stop here for now and leave to you to try figure for yourself how to get single question/answer pair from it.