input: def generate_response(question: str, answers: dict[str, str]) -> str:
      """
      Generate a response to a given question based on predefined answers or provide a "don't know" response.
      >>> generate_response('What is XYZ?', {'What is XYZ?': 'XYZ is a company that provides XYZ services.'})
      'XYZ is a company that provides XYZ services.'
      >>> generate_response('What does XYZ do?', {'What is XYZ?': 'XYZ is a company that provides XYZ services.'})
      'I am not sure I understand.'
      """
output:     if question in answers:
          return answers[question]
      else:
          return "I am not sure I understand."