input: def generate_response(question):
      """Generate an appropriate response to a given question about a product or service.
      The function checks if the question is in a predefined dictionary of answers and returns 
      the corresponding response. If the question is not found, it returns a random response from 
      a predefined list of unknown question responses.
      >>> generate_response('What is XYZ?')
      'XYZ is a company that provides XYZ services.'
      >>> generate_response('What does XYZ do?')
      'XYZ helps customers find solutions to their problems.'
      >>> generate_response('Where is XYZ located?')
      'XYZ is located in ABC city.'
      >>> generate_response('Some random question')
      ['I am not sure I understand.', 'Can you give me more information?', 'Can I help you with something else?']
      """
output:     predefined_answers = {
          'What is XYZ?': 'XYZ is a company that provides XYZ services.',
          'What does XYZ do?': 'XYZ helps customers find solutions to their problems.',
          'Where is XYZ located?': 'XYZ is located in ABC city.'
      }
      unknown_responses = [
          'I am not sure I understand.',
          'Can you give me more information?',
          'Can I help you with something else?'
      ]
      
      return predefined_answers.get(question, random.choice(unknown_responses))