You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: Tom was at his local gym. Sentence 2: He was running on the treadmill. Sentence 3: He stopped paying attention and tripped. Sentence 4: The treadmill sent him flying across the room. Sentence 5: Tom was too embarrassed to ever return. Choices: a. Gym Accident. b. Tired.
Output:
a