input: Write a function to create a chatbot in Python that provides customer support for a restaurant by responding to any user's question with a randomly selected appropriate response from a predefined list. The chatbot should read the user's question from a file named 'random_user_question.txt' and display the response. 
  
  assert chatbot()=="We serve a variety of dishes - from salads to pizzas to steaks!"
  assert chatbot()=="Check out our menu for a full list of options"
  assert chatbot()=="We serve a variety of dishes, including traditional Italian, Mexican, and American fare. What would you like to try?"
  assert chatbot()=="We have a great selection of meals! What kind of dish are you looking for?"
  assert chatbot()=="We have a unique selection of meals - have you checked out our menu?"
output: import random
  
  def chatbot():
      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', 'r') as file:
          file.read()
      return random.choice(responses)