A program that administers and grades a multiple-choice exam. It starts off with 5 questions and repeats the questions that were incorrectly answered until all questions have been correctly answered.

def quiz():
  questions = ['1. What color is the sky?\na. Blue\nb. Red\nc. Green\n', 
               '2. What color is the sun?\na. Blue\nb. Red\nc. Yellow\n', 
               '3. What color is an apple?\na. Blue\nb. Red\nc. Green\n', 
               '4. What color is a banana?\na. Blue\nb. Red\nc. Yellow\n', 
               '5. What color is the grass?\na. Blue\nb. Red\nc. Green\n']
  
  answers = ['a', 'c', 'b', 'c', 'c']
  
  print("Welcome to the quiz.")
  
  score = 0
  total = len(questions)
  n = 0
  
  while n < len(questions):
    print(questions[n])
    ans = input('Enter your answer: ')
    
    if ans == answers[n]:
      print("Correct!\n")
      score +=