How to fetch data from dataset using javascript or json

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C#

ASP.NET

Javascript

JSON

Hello everyone,

I have one database in which there is a table called question and another table called question_answers

there are 2 types of questions namely : multiple choice and single response..

I want to fetch the question and its answers using JSON ..
I am retrieving data using WebMethod from SQL database

my code is : JSON

function take_test(){
    $.ajax({
        type: "POST",
        contentType: "application/json; charset=utf-8",
        url: "LoadTest.aspx/GetQuiz",
        data: "{}",
        dataType: "json",
        success: function (data) {
            //            for (var i = 0; i < data.d.length; i++) {
            //                $("#tbDetails").append("<tr><td>" + data.d[i].UserId + "</td><td>" + data.d[i].UserName + "</td><td>" + data.d[i].Location + "</td></tr>");
            //            }
            alert(data);
        },
        error: function (result) {
            alert(result);
        }
    });
}

code behind :

  [WebMethod]
    // Let .net handle the request and response as json automatically.
    public static FetchQuiz[] GetQuiz(FetchQuiz q)
    {
        DataSet ds = new DataSet();
        List<FetchQuiz> details = new List<FetchQuiz>();
        SQLDataAccessHelper sq = new SQLDataAccessHelper();
        string query = "";
        query = "select * from tbl_question_master order by Id";
        ds = sq.ExecuteCommandText(query);
        for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
        {
            FetchQuiz quiz = new FetchQuiz();
            quiz.Question = ds.Tables [0].Rows[i]["question"].ToString();
            quiz.Answer = ds.Tables[0].Rows[i]["answer"].ToString();
           // quiz.CorrectAnswer = ds.Tables[0].Rows[i]["UserId"].ToString();
            details.Add(quiz);
        }

        return details.ToArray();
    }
}
public class FetchQuiz
{
    public string Question { get; set; }
    public string Answer { get; set; }
   // public string CorrectAnswer { get; set; }
    //public string Type { get; set; }

}

Now the problem here is i m not able to get data... also i am not aware how to iterate with data..

my data would be in this format

Question Id Type Question Answer
1 MCQ abc a
1 MCQ abc b
1 MCQ abc c
2 SR xyz a
2 SR xyz b


i want to display data in div tag in this format
[Question]
A [Option1]
B [Option2]
C [Option3]

and so on...

Please help me to achieve this.

Thanks in advance

Krunal