Randomized Quiz made in Java 17 using nothing but built in utils and a hashmap

Quiz.java

import java.util.*;

public class Quiz {

    private static Map<String, String> getQuestions() {
        Map<String, String> questions = new HashMap<>(); // create questions map
        // questions.put("Question", "Answer");
        questions.put("What is the main benefit of using IOPSX?\n A. Increased performance \n B. Reduced latency \n C. Improved scalability \n D. All of the above", "b");
        questions.put("What is the full name of IOPSX?\n A. Input/Output Parallel Storage Accelerator\n B. Input/Output Parallel Storage Extension\n C. Input/Output Parallel Storage Exchange\n D. Input/Output Parallel Storage Extractor\n", "a");
        return questions;
    }

    public static void main(String[] args) {
        final Scanner scanner = new Scanner(System.in); // Create scanner which will read user input
        final Random generator = new Random(); // create random number generator
        int score = 0; // Store the score
        Map<String, String> questions = getQuestions();

        while (!questions.isEmpty()) {
            Object[] questionmap = questions.keySet().toArray(); // convert questions map to array
            Object randomQuestion = questionmap[generator.nextInt(questionmap.length)]; // get random question from array
            String correctanswer = (questions.get(randomQuestion)); // get correct answer from random question
            System.out.println(randomQuestion);
            System.out.println("Enter your answer: ");
            String answer = scanner.nextLine();
            if (answer.toLowerCase().contains(correctanswer.toLowerCase())) {
                score++;
                System.out.println("\nCorrect!\n");
            } else {
                System.out.println("\nNope! The right answer was " + correctanswer + "\n");
            }
            questions.remove(randomQuestion); // remove question from map to prevent repetition
        }

        // Calculate score and display results
        System.out.println("Good job on finishing the test! Lets see how you did");
        System.out.println("You got (" + score + "/2) correct!\nThanks for playing!");
        System.exit(0);
    }
}