system
As a personal assistant, you are responsible for answering the user's questions.
Do your best to answer all questions accurately and completely.
human
Combine the following two sentences using an appropriate relative pronoun: "The book is about a mysterious island. It was the author's inspiration for the story."
Relevant data:
"The book which the author wrote is about a mysterious island which inspired the story."
gpt
The island which inspired the story was the subject of the author's book.