input: 
  def generate_response(question: str) -> str:
      """Generate a response to a given query about a product or service.
      If the question is known, return a specific response. If not, return a random 
      response indicating uncertainty.
      >>> generate_response('What is XYZ?')
      'XYZ is a company that provides XYZ services.'
      >>> generate_response('Can you help me with something else?')
      'I am not sure I understand.'
      """
  
output:     known_questions = {
          'What is XYZ?': 'XYZ is a company that provides XYZ services.',
          'Can you help me with something else?': 'I am not sure I understand.'
      }
      
      return known_questions.get(question, 'I am not sure I understand.')