QUESTION: The accelerator was controller via a hand throttle, and the foot pedals controlled the steering in the small what?
Options:
- car
- fuel system
- accelerate
- boat
- airplane
ANSWER W/ DETAILS: The answer is airplane
Explanation: Aeroplane can control the acceleration via hand throttle..

QUESTION: Where are people likely to sing?
Options:
- apartment
- supermarket
- train station
- opera
- conference
ANSWER W/ DETAILS: The answer is opera
Explanation: Opera is an ancient musical art form including theatrical work. Opera includes singing. People usually sing at Opera..

QUESTION: It's dangerous to let pet birds free so it's better to keep them what?
Options:
- slavery
- caught
- caged in
- topfree
- prisoner
ANSWER W/ DETAILS:

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 answer is caged in
Explanation: Companion birds are kept in cages because they are not used to roam in the wild..