input: 
  def generate_response(question):
      """Generates a response to a given question about a product or service using a predefined dictionary of answers. If the question is not found in the dictionary, it provides a random response.
      
      >>> generate_response('What is XYZ?')
      'XYZ is a company that provides XYZ services.'
      >>> generate_response('Where is XYZ located?')
      'XYZ is located in ABC city.'
      >>> generate_response('Unknown question')
      'I am not sure I understand.'
      """
  
output:     responses = {
          'What is XYZ?': 'XYZ is a company that provides XYZ services.',
          'Where is XYZ located?': 'XYZ is located in ABC city.',
          'How does XYZ work?': 'XYZ works by using advanced technology to deliver XYZ services.'
      }
      
      return responses.get(question, 'I am not sure I understand.')