using System;

using System.Linq;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var jArray = JsonConvert.DeserializeObject<JArray>("[[123,\"android\"],[345,\"iod\"]]");

        var t = jArray.ToDictionary(

                    k => k,

                    v => v.Values()

                        .First()

                        .Value<object>());

        Console.WriteLine(t.First());

    }

}