private void showRightAnswer() {
        if (GameController.getInstance().isCorrect(jBAnswer1.getText())) {
            jBAnswer1.setForeground(Color.GREEN);
            JOptionPane.showMessageDialog(rootPane, "Tacan odgovor je " + jBAnswer1.getText());
        }
        if (GameController.getInstance().isCorrect(jBAnswer2.getText())) {
            jBAnswer2.setForeground(Color.GREEN);
            JOptionPane.showMessageDialog(rootPane, "Tacan odgovor je " + jBAnswer2.getText());
        }
        if (GameController.getInstance().isCorrect(jBAnswer3.getText())) {
            jBAnswer3.setForeground(Color.GREEN);
            JOptionPane.showMessageDialog(rootPane, "Tacan odgovor je " + jBAnswer3.getText());
        }
        if (GameController.getInstance().isCorrect(jBAnswer4.getText())) {
            jBAnswer4.setForeground(Color.GREEN);
            JOptionPane.showMessageDialog(rootPane, "Tacan odgovor je " + jBAnswer4.getText());
        }
        try {
            //wait 2 seconds
            Thread.sleep(2 * delay);
        } catch (InterruptedException ex) {
            Logger.getLogger(PlayFrame.class.getName()).log(Level.SEVERE, null, ex);
        }
        backToNormal();
    }