I'll give you a question, please answer with step-by-step reasoning process.
Where would a person find information in the old days?\nOptions:\n- dewey decimal system\n- book\n- library\n- newspaper\n- internet

book
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.

.

The answer is book