public class CustomerSurvery
    {
        public CustomerSurvery()
        {
            this.Questions = new List<CustomerServeyQuestionModel>();
        }

        public List<CustomerServeyQuestionModel> Questions { get; set; }
    }

    public class CustomerServeyQuestionModel
    {

        public CustomerServeyQuestionModel()
        {
            this.Answers = new List<CustomerSurveyAnswerModel>();
        }

        public string QuestionId { get; set; }
        public string Question { get; set; }
        public List<CustomerSurveyAnswerModel> Answers { get; set; }
    }

    public class CustomerSurveyAnswerModel
    {
        public string Answer { get; set; }
    }