Q: Where can you buy previously owned metal items?
Options:
- instruments
- hobby lobby
- junkyard
- ore
- car
A: Let me think step-by-step: Junkyard has many old things including a previosuly owned metal. The answer is junkyard.

Q: Where is the best way to store personal knowledge?
Options:
- university
- encyclopedia
- book
- safe
- head
A: Let me think step-by-step: Head is the upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth and sense organs. Head is the best way to store personal knowledge. The answer is head.

Q: Why is waiting for the doctor difficult for people who need to do work?
Options:
- having appointements
- being late
- have time to think
- time consuming
- impatience
A:

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
Let me think step-by-step: To wait for someone is a time consuming task for the one who waits. Waiting for the doctor is difficult and very much time consuming for the people who need to do work. The answer is time consuming.