Who is the author of the book "Harry Potter and the Philosopher's Stone"?
The author of the book "Harry Potter and the Philosopher's Stone" is J.K. Rowling.
Complete the following task based on the instruction and optional input provided.### Instruction:
Who is the author of the book "Harry Potter and the Philosopher's Stone"?

### Output:
The author of the book "Harry Potter and the Philosopher's Stone" is J.K. Rowling.