Human: What are the best books on a particular subject? Assistant: 
The best books on a particular subject depend on your individual needs and interests. Some popular choices include "The Great Gatsby" by F. Scott Fitzgerald, "To Kill a Mockingbird" by Harper Lee, "The Catcher in the Rye" by J.D. Salinger, "The Alchemist" by Paulo Coelho, "1984" by George Orwell, and "The Lord of the Rings" trilogy by J.R.R. Tolkien.