Suppose this code:

jQuery(function($) {
    $(document).find('.answer-choice').on('click', function() {
        $(this).addClass('loading-gif');

        var form = $('form#submit_quiz');
        var quiz = form.find('input[name="quiz"]').val();
        var ticket = form.find('input[name="ticket"]').val();
        var _wpnonce = form.find('input[name="ticket_nonce"]').val();

        $.ajax({
            url: public_quiz_participation.ajax_url_answer_question,
            method: 'post',
            //dataType: 'json',
            data: {
                action: 'lottery_answer_question',
                status: 'answered_question',
                quiz: quiz,
                ticket: ticket,
                question: $(this).data("question"),
                answer: $(this).data("answer"),
                _wpnonce: _wpnonce
            },
            success: function(response) {
                console.log($(this));

                // Here, among some other things, I want to 1. remove the class 'loading-gif' from the choice the user clicked, and 2. (with the help of some DOM tree traversing) add a 'disabled' class to that answer and the rest choices (its siblings) of the particular question. Part 2. is actually easy enough. My problem is that $(this) isn't available anymore to the success event function.
            },
            error: function() {
                swal.fire({
                    type: 'info',
                    html: "<h2>" + quiz.loadResource + "</h2><br><h6>" + quiz.somethingWentWrong + "</h6>"
                });
            }
        });

    });
});

Basically my question is in a comment in the code above, but I'm pasting it below also, so that it's more readable:

Here, among some other things, I want to 1. remove the class 'loading-gif' from the choice the user clicked, and 2. (with the help of some DOM tree traversing) add a 'disabled' class to that answer and the rest choices (its siblings) of the particular question. Part 2. is actually easy enough. My problem is that $(this) isn't available anymore to the success event function.

So, how can I pass the $(this) as a variable to the success event's function?