In the analogy “Library is to book as book is to ____”, which option best represents what a book contains?

Introduction / Context:
This analogy uses simple real world objects to test your understanding of part whole relationships. A library contains many books. In the same manner, a book contains smaller units that make up its structure. You must choose which option plays the same role for a book that a book plays for a library. This style of question appears frequently in verbal reasoning exams.

Given Data / Assumptions:

• First pair: Library and book.
• Second pair: Book and an unknown part.
• Options: words, pages, binding, cover, chapters.
• We consider what a library stores and what a book is made of physically.

Concept / Approach:
A library is a collection of books. The relation is “larger container that holds many units” to “unit contained.” For the second pair, we need an item that a book contains many of in a similar structural sense. Physically, a book is made up of pages. While a book also contains words and chapters, pages are the basic physical units that are counted, just as books are counted within a library. Therefore, the best analogy is book to pages.

Step-by-Step Solution:

Step 1: Understand the first pair. A library is a place where many books are stored. Step 2: Recognise the relationship type as “collection and its items.” Step 3: Apply the same idea to the book. A single book is a collection of smaller physical units. Step 4: Identify those units. Pages are the sheets of paper that together form the book. Step 5: Confirm that among the options, pages most closely match the role that books play in the library.

Verification / Alternative check:
Check the other candidates. A book indeed contains words and chapters, but these are content elements, not independent physical items similar to books in a library. Binding and cover are parts of the physical structure but are not multiple countable units inside the book. Since a library is counted in terms of how many books it contains, the parallel is a book counted in terms of how many pages it contains. This one to many relation is strongest with pages.

Why Other Options Are Wrong:
Words are content, but they are extremely numerous and do not correspond to the simple, countable structural units that form a book. Binding and cover are single components, not multiple items that a book can be said to be a collection of. Chapters are content divisions, not physical sheets. Pages are both numerous and structurally essential, so they most cleanly mirror the library book relationship.

Common Pitfalls:
Some test takers pick words because they think of what is read in a book, rather than how the analogy is structured. Others may choose chapters because they sound like subdivisions. When handling analogies, do not just look for any association; instead, identify the precise type of connection in the first pair and replicate it in the second pair. Here, the physical collection idea points directly to pages.

Final Answer:
The correct completion is that a book stands to its pages as a library stands to its books.