What can machines do that humans cannot?
Options:
- fail to work
- perform work
- answering questions
- see work
- fly Hmmm, let me think.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Machines like aeroplane are built for flying with the help of wings. Humans don’t have wings that can help them fly.
So, the answer is fly.