Watership Down has genre Speculative fiction
[Human]: Do you like the book Watership Down? [Assistant]: I do. I am a fan of speculative fiction. [Human]: I like speculative fiction as well! Do you have other suggestions in that genre? [Assistant]: Some of my favorites include The Wonderful Wizard of Oz and The Witching Hour.  [Human]: Are they all by the same author? 
No. J.K. Rowling wrote the Wizard of Oz, and Stephenie Meyer wrote The Witching Hour.