Went crazy with two dimensional arrays, can this be made to work?

edit: I thought I was posting this on the discussion page for the video/challenge but I guess not. Also can't figure out how to delete threads, assuming that's an option. Here's the link to what I'm working on. In short, make a quiz program that stores data in arrays.

Hello! I went browsing through the other questions on here, and it seems my intended solution was a bit different than the others I'm seeing here. I wanted to store a boolean value in the same two dimensional array as my user responses, as the two seemed like related pieces of data. Unfortunately, my solution also isn't working. Every time I run it, I enter all three prompts but only 2 print, and I get a console error saying:

TypeError: answers[i] is undefined | quiz.js:18:19

Here's some of my code, pick it apart:

function print(message) {
  document.write(message);
}
//Questions and Answers
var quizContent = [
  ["what... is your name?", "lancelot"],
  ["What... is your quest?", "holy grail"],
  ["What... is your favorite color?", "blue"]
]
//Hold user answer and boolean to indicate correctness
var answers = [[''],[false]];
//Total number of questions answered correctly
var score = 0;
var i= 0

for (i = 0; i < quizContent.length; i++){
  answers[i][0] = prompt(quizContent[i][0]); //Collect response
  answers[i][0] = answers[i][0].toLowerCase(); //Match case
  //check for equality, update scores
  if (answers[i][0] === quizContent[i][1]){
    answers[i][1] = true;
    score++;
  }
  else {
    answers[i][1] = false;
  }
  //Testing code before moving on
  print(answers[i][0] + answers[i][1]);
}

Eventually I'll probably expand my code out and do it the long way, but I wanted to give a more condensed approach a try. Thanks in advance for any advice.

Edit: There are a few oddities in the code from me trying to isolate issues. For instance, declaring my index variable outside of my for loop was to see if there was something weird with scope. I have some blank data in my answers array to see if I needed to set my data type ahead of time, etc. On both of those, I tested it both with and without but forgot to change it back to it's original state.