A C++ Quiz App that demonstrate the use of map as data structure

quizAppReFac.cpp

#include <iostream>
#include <string>
#include <map>
int score =0, answer;
struct Question {
    std::string text;
    std::string options[4];
    int correct_answer;
};
std::map <int, Question> data = 
{
    {0,{"Who is the author of C++?",  {"Linus Torvalds", "Ada Lovelace", "Bjarne Stroustrup", "Brendan Eich"}, 3}},
    {1, {"The year when C++ first appeared: ", {"2021", "1991", "2005", "1985"}, 4}},
    {2, {"What is C++ most current version? (in 2021)", {"C++21", "C++20", "C++1", "C++17"},2}},
    {3, {"Which one of the following is a valid extension for C++ file?",{".cpp", ".xml", ".ts", ".rs"},1}},
    {4, {"C++ Author was born in:", {"Amsterdam, Netherland", "Stockholm, Sweden", "Madrid, Spain", "Aarhus, Denmark"}, 4}}
};
class Quiz{
    public:
    void printQuestion(std::string options[4]){
        for(int i = 0; i<4; i++){
            std::cout << (i+1)<< ".- " << options[i] << std::endl;
        }
    }
    void checkIsCorrect(int answer, int correct_answer){
        if (correct_answer == answer)
    {   score++;
        std::cout << "Your selection is correct\n";
    }
    else
    {
        std::cout<< "Your selection is wrong. Correct answer is " << correct_answer << std::endl;
       
    }
    }

    void start(){
        std::cout << "Welcome to the Quiz App!!\n";
        auto it = data.begin();
        while(it != data.end()){
            std::cout<< it->second.text<<std::endl;
            printQuestion(it->second.options);
            std::cin >> answer;
            checkIsCorrect(answer, it->second.correct_answer);
            it++;
        }
        if(score ==5){
            std::cout << "End of game. You got all " << score << " of them! Perfect Score!"<< std::endl;
        }else{
             std::cout << "End of game. Your final score is " << score << std::endl;
        }
       
    }
};

int main()
{
    
    Quiz quiz;
    quiz.start();
    return 0;
}