Use reasoning to lead to the answer of the following question:
What often happens after a long day of traveling?
Options:
- sickness
- motion sickness
- relocation
- jet lag
- fatigue
 Reasoning process:

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
A person may feel fatigue after a long day of traveling. Long traveling leads to fatigueness. Therefore, the final answer is fatigue.