Quiz aborts after first two questions

var correctPoints = 0;


/* QUESTIONS */

var answer1 = prompt("1. Which tube line is silver in color?");
if ( answer1.toUpperCase() === "JUBILEE" ) {
  correctPoints += 1;
}

var answer2 = prompt("2. Which borough includes the Houses of Parliament and Buckingham Palace?");
if ( answer3.toUpperCase() === "WESTMINSTER" ) {
  correctPoints += 1;
}

var answer3 = prompt("3. In which travel card zone is Camden Town station?");
if ( answer3.toUpperCase() === "2" ) {
  correctPoints += 1;
}

var answer4 = prompt("4. In which neighbourhood can you find the famous Electric Avenue?");
if ( answer4.toUpperCase() === "BRIXTON" ) {
  correctPoints += 1;
}

var answer5 = prompt ("5. At which National Rail station can you interchange with the Bakerloo, Hammersmith & City, Circle and District lines?");
if ( answer5.toUpperCase() === "PADDINGTON" ) {
  correctPoints += 1;
}


/* RESULTS */

document.write("<p>You got " + correctPoints + " questions correct!<p>");

if (correctPoints === 5) {
  document.write("<p>You win a <strong>gold</strong> crown!</p>");
} else if (correctPoints >=3) {
  document.write("<p>You win a <strong>silver</strong> crown!</p>");
} else if (correctPoints >0) {
  document.write("<p>You win a <strong>bronze</strong> crown!</p>");
} else {
  document.write("<p>You win a no crown :(</p>");
}