Choose the pair of words in which the relationship between the two words is different from the relationship in the other pairs.

Introduction / Context:
This question tests your ability to classify word pairs based on the type of relationship they represent. Four of the pairs show one type of logical connection, while one pair represents a different kind of link. Your job is to find the pair whose relationship does not match the others.

Given Data / Assumptions:

• Farmer : Plough.
• Butcher : Chopper.
• Author : Book.
• Jockey : Tack.
• Carpenter : Hammer.
• All of these pairs involve a person and an object or product related to that person role.

Concept / Approach:
A useful approach is to decide whether the second word in each pair is primarily a tool used by the person, or something produced by the person. If four pairs show a \"user : tool\" or \"worker : instrument\" relationship and one pair shows a \"creator : product\" relationship, then the latter will be the odd one out. Classification questions often hinge on this sort of subtle difference.

Step-by-Step Solution:
Step 1: Look at \"Farmer : Plough\". A plough is a tool used by a farmer for tilling the soil. This pair clearly shows a worker and a work tool.Step 2: Consider \"Butcher : Chopper\". A chopper is a large knife or cleaver used by a butcher to cut meat. Again, this is a worker and the tool or instrument used in the job.Step 3: Analyse \"Jockey : Tack\". Tack refers to the riding equipment such as saddles and bridles used in horse riding. A jockey uses this tack while riding horses. This is again a professional and equipment relationship.Step 4: Examine \"Carpenter : Hammer\". A hammer is one of the most common tools used by a carpenter in woodworking. This fits perfectly into the worker and tool category.Step 5: Now look at \"Author : Book\". An author does not use a book as a tool in the same sense. Instead, the book is the product or creation of the author efforts. The relationship here is creator and creation, not user and instrument.Step 6: Compare the type of relationship: in four pairs the second word is a piece of equipment essential for performing the work; in one pair, the second word is the outcome of the work.Step 7: Therefore, \"Author : Book\" is the pair that is differently related.

Verification / Alternative check:
Ask yourself, \"Can the first person carry out their typical work without the second item?\" A farmer cannot properly plough fields without a plough, a butcher needs cutting tools like a chopper, a jockey needs tack to ride professionally, and a carpenter heavily relies on a hammer and similar tools. An author, however, does not use a finished book as a tool to write; they may use a pen, keyboard or computer. The book is the result after the writing is complete, which confirms the different relationship.

Why Other Options Are Wrong:
Farmer : Plough, Butcher : Chopper, Jockey : Tack and Carpenter : Hammer all show the same clear pattern: a worker and an instrument used in that work. Since they share the same type of link, they are not the odd pair. Only Author : Book breaks this pattern by showing a creator and a finished product.

Common Pitfalls:
Candidates sometimes think too literally and focus only on whether the words are related at all. All these pairs are related, but that is not enough. You must look at how they are related. Another common mistake is to confuse tools with products. Remember, a tool is used to perform work, while a product is the outcome of that work.

Final Answer:
The pair in which the words are differently related is Author : Book.