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