Because of foot rails coming loose, he always kept a screwdriver behind the what?
Options:
- toolbox
- bookcase
- bar
- repair shop
- toolkit Let's give stream of consciousness first:

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
Foot rails are used in bars normally. Screwdriver can be kept behind the bars if the foot rails are loose.
Therefore, the answer is bar.