He had an index card he had to return, so where did he put it after finding the book he needed?\nOptions:\n- inside the book\n- oral report\n- library\n- fileing cabnet\n- card catalogue
Let's think carefully first. Step-by-step reasoning process:
User
The organized collection of cards is called card catalogue. He had an index card he had to return, so he put it in a card catalogue after finding the book he needed. So the final answer is card catalogue.
Assistant