WCF Services please help in datacontract

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WCFServices

I have created this in data contract
but when i create client proxy it give only one class ie StandardClass
can any one please i want both class

is their way i have created Business entity class that class i want in client proxy without adding
[DataContract] and [DataMember]

 [DataContract]
 public class StandardClass
    {
        [DataMember]
        public int Std_Id;
        [DataMember]
        public string Std_Name;

    }
    [DataContract]
    public class QuestionEntityClass
    {
        [DataMember]
        public int Quest_Id;
        [DataMember]
        public int? Std_Id;
        [DataMember]
        public string Question;
        [DataMember]
        public string Optn1;
        [DataMember]
        public string Optn2;
        [DataMember]
        public string Optn3;
        [DataMember]
        public string Optn4;
        [DataMember]
        public string Ans;

    }

My Bussiness_Entity.cs

  [Serializable]
    public class Edulight_Entity
    {
   [Serializable]
        public class Standard : Edulight_Entity
        {
            public int Std_Id { get; set; }
            public string Std_Name { get; set; }

        }
        [Serializable]
        public class QuestionEntity : Edulight_Entity
        {
            public int Quest_Id { get; set; }
            public int? Std_Id { get; set; }
            public string Question { get; set; }
            public string Optn1 { get; set; }
            public string Optn2 { get; set; }
            public string Optn3 { get; set; }
            public string Optn4 { get; set; }
            public string Ans { get; set; }

        }
}