@FormUrlEncoded
    @POST("api/sponsors")
    Call> getStatesAndDistrict(
            @Field("xyz") String field1
    );



   Call > call = service.getSponsorsValue();

    call.enqueue(new Callback>() {
        @Override
        public void onResponse(Call> call, Response> response) {

            List rs = response.body();

        }

        @Override
        public void onFailure(Call> call, Throwable t) {

        }
    });