Please Review my Code

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 correct = [];
var wrong = [];

var correctAnswers = 0;
var wrongAnswers = 0;
var question;
var answer;
var response;
var html;

function print(message) {
  document.write(message);
}

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(questions[i][0]);
  } else {
    wrongAnswers +=1
    wrong.push(questions[i][0]);
  }
}

html = "You got " + correctAnswers + " question(s) right. "
html += "You got " + wrongAnswers + " question(s) wrong."
html += "<h3>You got these questions correct:</h3>" + correct.join(',');
html += "<h3>You got these questions incorrect</h3>" + wrong.join(',');
print(html);