What kind of explosive device has a fuse or timer?
Options:
- war
- fireworks display
- action film set
- bomb
- construction site
Step-by-step reasoning process below:

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
Bomb is a kind of an explosive device. There is a fuse or timer in a bomb. The answer: bomb.