input: 
  import random
  
  def restaurant_chatbot(filename: str) -> str:
      """This function reads a user's question from a specified file and provides a random helpful response about the meals served in the restaurant.
  
      The function reads the user's question from the given file, selects a random response from a predefined list of possible answers, and prints the response.
  
      Example:
      for restaurant_chatbot('random_user_question.txt') == 'We serve a variety of dishes - from salads to pizzas to steaks!'
      """
      # 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(filename) as user_question:
          question = user_question.read()
  
      # choose a random response
      response = random.choice(possible_responses)
  
      # return the response to the user
      return response
  
output:     # return the response to the user
      return response