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: Terry always enjoyed playing chess. Sentence 2: He challenged his grandfather to a game. Sentence 3: His grandfather was very good. Sentence 4: They played many games that afternoon. Sentence 5: Terry and his grandfather both won and had a good time. Choices: a. A Game of Chess. b. Unknown.

a