Fetch a Single Key Value pair from my Retrofit response

Question

I am getting a response from the GET method in the form of

{data : { "type " : User ........ "attribute" : { "isemailverified" : false.....}....}

I want to fetch the value of isemailverified

I am using Retrofit to fetch data

useCaseFactory.getUserDomainModel().GetUser(userId, withDataArray, null, new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        System.out.println("ERROR: " + e.getMessage());
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        ResponseBody responseBody = response.body();                
                        System.out.println(response.body().string());

                    }