Q: What country currently contains the river danube?
Options:
- yugoslavia
- austria
- nile
- bulgaria
- czechoslovakia
A: bulgaria
Explain how we arrive at this answer:

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
Explanation: Bulgaria is a country. The river danube is currently in bulgaria.