access the return value from boolean ajax call

Question

I have an ajax call that returns a boolean. The method on the server works fine. How can I access the return data from this function and use it?

var hasCondition = function () {                    
    $.ajax({
        url: "mhqpreinterview.aspx/hasconditions",
        type: "POST",
        contentType: "application/json; charset=utf-8",
        datatype: "json",
        data: JSON.stringify({ questionNumber: ClickedQuestion }),
        success: function (data) {

        }
    });
}

if (hasCondition()) {
//stuff
}