Where would a person find information in the old days?
Options:
- dewey decimal system
- book
- library
- newspaper
- internet Hmmm, let me think.

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
Books are considered the oldest mass medium. When writing was invented in ancient times, anything that could be written upon was used. A person would find information in book in the old days.
So, the answer is book.