using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var Answer = "17519,  ,  , ,A,B,D,A,D,B,A,C,B,A,C,D,B,D,B,D,D,B,A,D,D,B,B,A,B,A,D,C,B,C,C,B,A,A,C,A,D,B,C,C,A,D,A,D,A,B,B,B,A,B".Split(',').ToArray();

            var Quiz = "17519,Test,Person,middle,x,A,B,A,D,B,A,C,B,B,C,D,B,D,B,D,D,B,A,B,D,B,B,A,B,A,D,C,B,C,C,B,A,A,C,A,D,B,C,C,A,D,A,D,A,B,B,B,A,B".Split(',').ToArray();

​

            List<string> differentvalues = Answer.Select((item, index) => new { item, index })

                           .Where(x => x.item != Quiz[x.index])

                           .Select(x => String.Format("{0}{1},", x.index, Quiz[x.index].ToLower()))

                           .ToList();

            //Remove first four values and start with 4th index

            differentvalues.RemoveRange(0, 3);

        foreach(string item in differentvalues)

        {

            Console.WriteLine(item);

        }

    }

}