input: Write a function named `generate_chatbot_response` that implements a chatbot for customer support in a restaurant. The function should read a text file containing a user's question, and then return a random response from a predefined list of possible responses. If the file contains the question "What meals do you serve?", the function should return one of the following 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?", or "We have a unique selection of meals - have you checked out our menu?".
  
  assert generate_chatbot_response('random_user_question.txt') in [
      '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?'
  ]
  assert generate_chatbot_response('some_other_file.txt') == None
output: import random
  
  def generate_chatbot_response(filename):
      with open(filename, 'r') as file:
          question = file.read().strip()
      if question == "What meals do you serve?":
          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?"
          ]
          return random.choice(responses)
      return None