Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: Tom wanted to be a published author. Sentence 2: He was a subject matter expert regarding martial arts. Sentence 3: He decided to write about the combative arts. Sentence 4: He wrote a great book. Sentence 5: He became a published author. Choices: a. Ugly Sweater. b. Book.

b