@Override
	public String getAnswer() {
		ArrayList<String> answerList = new ArrayList<String>();
		for (String a : answer.keySet()) {
			if(answer.get(a))
				answerList.add(a);
		}
		StringBuilder string = new StringBuilder(); 
		string.append(answerList.get(0));
		for (int i = 1; i < answerList.size(); i++) {
			string.append(", " + answerList.get(i));
		}
		return string.toString();
	}