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: Thomas heard a noise outside. Sentence 2: He went to see what the noise was. Sentence 3: It was dark outside. Sentence 4: He didn't see anything. Sentence 5: The next morning Thomas noticed that someone had taken his bike. Choices: a. Dentist Appointment. b. The Noise Outside.

b