Use reasoning to lead to the answer of the following question:
The toilet were somewhat built into the suits of the zero gravity travelers on the what?
Options:
- aircraft
- space shuttle
- stadium
- restaurant
- bathroom
 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
The toilet were built into the suits of the zero gravity travellers on the space shuttle. Therefore, the final answer is space shuttle.