input: Write a function to implement a chatbot that can provide customer support in a restaurant. The chatbot should read user questions from a file named "random_user_question.txt" and respond with a random message from a predefined list of possible answers. The function should return the chosen response as a string.
  
  def restaurant_chatbot():
      # list of possible answers
      possible_responses = [
       'We serve a variety of dishes - from salads to pizzas to steaks!',
       'Check out our menu for a full list of options',
       'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
       'We have a great selection of meals! What kind of dish are you looking for?',
       'We have a unique selection of meals - have you checked out our menu?'
      ]
      
      # read the user's question
      with open('random_user_question.txt') as user_question:
          question = user_question.read()
      
      # choose a random response
      response = random.choice(possible_responses)
      
      return response
  
  assert restaurant_chatbot() == 'We serve a variety of dishes - from salads to pizzas to steaks!'
  assert restaurant_chatbot() == 'Check out our menu for a full list of options'
  assert restaurant_chatbot() == 'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?'
  assert restaurant_chatbot() == 'We have a great selection of meals! What kind of dish are you looking for?'
  assert restaurant_chatbot() == 'We have a unique selection of meals - have you checked out our menu?'
output: import random
  
  def restaurant_chatbot():
      possible_responses = [
       'We serve a variety of dishes - from salads to pizzas to steaks!',
       'Check out our menu for a full list of options',
       'We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?',
       'We have a great selection of meals! What kind of dish are you looking for?',
       'We have a unique selection of meals - have you checked out our menu?'
      ]
      
      with open('random_user_question.txt') as user_question:
          question = user_question.read()
      
      response = random.choice(possible_responses)
      
      return response