How could I display the correct answers with each of the questions? Trying to go a step further and can't figure it out

var questions = [
  ["O'Brien wants to know, what's 2+2= ?",  "5"],
  ["O'Brien wants to know, what's 2+2= ?",  "3"],
  ["O'Brien wants to know, what's 2+2= ?",  "4"],
  ["O'Brien wants to know, what's 2+2= ?",  "All of them at once."],
  ["O'Brien wants to know, what's 2+2= ?",  "Do it to Julia!"]
];

var correctAnswers = 0;
var question;
var answer;
var response;
var html;
var correct = [];
var wrong = [];


function print(message) {
  var outputDiv = document.getElementById("output");
  outputDiv.innerHTML = message;
}

function buildList(arr) {
  var listHTML = '<ol>';
    for (var i=0; i<arr.length; i+=1) {
      listHTML += '<li>' + arr[i] + '</li>';
    }
  listHTML += '</ol>';
  return listHTML;
}


for (var i=0; i<questions.length; i+=1) {
  question = questions[i][0];
  answer = questions[i][1];
  response = prompt(question);
  if (response ===answer) {
    correctAnswers +=1;
    correct.push(question);
  }else {
    wrong.push(question); 
  }
}


html = "You answered " + correctAnswers + " answer(s) correct.  Double Plus (un)Good!"
html += "<h2>You answered these questions correct:</h2>"
html += buildList(correct);
html += "<h2>You answered the following questions incorrect:</h2>"
html += buildList(wrong);

print(html);