Multiple choice tests with Python

With the following script you can take a text with multiple choices like these

What is .....
the first
the second
the fourth
the fifth

What is ....
x
y
z
v

Where the first answer is the right one.

The script will:

add the number to each question
add a letter to each answer
shuffle the answers
create a file with the test (in html)
create a file with the correct answer (in txt)

The code

from tkinter import filedialog
import os
from random import shuffle

'''
            THIS CODE TAKES A TXT FILE
            WITH QUESTIONS WITH 4 ANSWER
            DIVIDED BY AN EMPTY LINE,
            GIVE A NUMBER TO QUESTION
            SHUFFLES ANSWERS AND GIVES THEM A LETTER
            IT CREATES A CORRETTORE whith the right answers
            in the correttore.txt


'''


a = filedialog.askopenfilename(initialdir = ".",title = "Select file",filetypes = (("text","*.txt"),("all files","*.*")))
# a = "preliminari_2.txt"
with open(a, "r", encoding="utf-8") as file:
    file = file.readlines()

html = ""
newdom = 1
risposte = []
letters = "abcd"
countdom = 1
corrette = []
for line in file:
    if line == "\n":
        newdom = 1
        continue
    if newdom == 1:
        html += f"<b>{countdom}. {line}</b><br>"
        newdom = 0
        countdom += 1
    else:
        risposte.append(line)
    if len(risposte) == 4:
        corrette.append(f"{countdom - 1}: {risposte[0]}")
        shuffle(risposte)
        for n, risposta in enumerate(risposte):
            html += f"{letters[n]}. {risposta}<br>"
        risposte = []
        newdom = 1
        html += "<br>"


with open("output.html", "w", encoding="utf-8") as file:
    file.write(html)

with open("correttore.txt", "w") as file:
    file.write("".join(corrette))
os.startfile("output.html")