.push() wont grab correct variable

questionsCorrect.push(questions[i]);

JavaScript
var questions = [
  ['How many states are in the United States?', 50],
  ['How many continents are there?', 7],
  ['How many legs does an insect have?', 6]
];
var correctAnswers = 0;
var wrongAnswers = 0;
var question;
var answer;
var response;
var html;

var questionsCorrect = [];
var questionsWrong = [];

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

function printList( list ) {
  var listHTML = '<ol>';
  for ( var i = 0; i < list.length; i += 1) {
    listHTML += '<li>' + list[i][0]  + '</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);
  response = parseInt(response);
  if (response === answer) {
    correctAnswers += 1;
    questionsCorrect.push(question);
  } else {
    wrongAnswers += 1;
    questionsWrong.push(question);
  }
}

html = "<h2>You got " + correctAnswers + " question(s) right.</h2>"
html += "They were: " + printList(questionsCorrect);
html += "<h2>You got " + wrongAnswers + " question(s) wrong.</h2>"
html += "They were: " + printList(questionsWrong);
print(html);