Only Questions print. Can someone explain the error? The right and wrong lists don't print.

var questions = [ ['What time is noon?', '12'], 
                 ['How many is a few?', 3],
                 ['When is too early?', '6'] ];

var correctAnswers = 0
var question;
var answer;
var response;
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 = parseInt( prompt(question));
  if (response === answer) {
   correctAnswers += 1;
    correct.push(question);
  } else {
    wrong.push(question);

  }
}

html = "You got " + correctAnswers + " question(s) right.";
html += '<h2>You got these questions correct:</h2>';
html += buildList(correct);
html += '<h2>You got these wrong:</h2>';
html = buildList(wrong);
print(html);