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 have the best grade in his class. Sentence 2: He studied hard and often. Sentence 3: He was second only to another kid at first. Sentence 4: After a short while he overtook him. Sentence 5: Tom got the highest grade. Choices: a. Dog on the Loose. b. Best in Class.

b