public class Response
{
    public string Version {get;set;}
    public int StatusCode {get;set;}
    public object Result {get;set;}
}

{
    "Version":"1.2.3",
    "StatusCode":200,
    "Result":
    {
        "Id":42,
        "QuestionText":"This is a test question",
        "QuestionImageUrl": "http://www.blah.com/test.png"
    }
}

var result = JsonConvert.DeserializeObject<Response>(json);