While Loop

[Larz60+]

def quiz(question, solution):
    answer = input("State the solution to the quiz: ")
    if answer == solution:
        return True
    else:
        print("Wrong Answer!\nTry again...\n")
        answer = input("State the solution to the quiz: ")
        while quiz(question, solution) == False:
            print("Wrong Answer!\nTry again...\n")

Line 8 is calling quiz, the function that it's part of, (this is called recursion),
to avoid this, your while statement needs to encompass everything from answer to the end like:

def quiz(question, solution):
    answer = None
    while answer is None:
        answer = input("State the solution to the quiz: ")
        if answer != solution:
            print("Wrong Answer!\nTry again...\n")
            answer = None
    return True