input: def generate_response(question: str) -> str:
      """ This function generates a response to a given question about a product or service.
      If the question is in the pre-defined set of answers, it returns the corresponding answer.
      If the question is not in the pre-defined set, it returns a random response indicating uncertainty.
      
      >>> 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('Who are you?')
      'I am not sure I understand.'
      """
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.',
          'How does XYZ work?': 'XYZ works by analyzing customer needs and providing tailored solutions.',
          'Where is XYZ located?': 'XYZ is headquartered in City, Country.'
      }
      
      return predefined_answers.get(question, 'I am not sure I understand.')