How to loop to ask question again using if-else statements python

I'm trying to make my program run where if someone gets the question wrong (i.e. the user enters a number to large or too little that it will ask the user to input an Answer again. I've tried using While True: loops, but that makes my program have an infinite loop that never ends. Any help would be appreciated

import random

def main() :
    # Generate two random numbers between 1 and 100
    n1 = random.randint(1,100)
    n2 = random.randint(1,100)

    # Ask the answer
    print("What is the sum:",n1,"+",n2)
    attempt = 1
    answer = int(input("Answer: "))


    if answer != n1 + n2 and answer < n1 + n2:
        print("Wrong! The correct answer is greater than " + str(answer) + ".")
    else:
        if answer != n1 + n2 and answer > n1 + n2:
            print("Wrong! The correct answer is less than " + str(answer) + ".")
        else:
            if answer == n1 + n2:
                print("Yes! The correct answer is " + str(answer) + "." + "\n You got it in " + str(attempt) + " attempts.") 
                exit()

main()