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: Jake lived in northern California. Sentence 2: There was a bad earthquake about 100 miles from him. Sentence 3: He knew something was strange when his bed shook. Sentence 4: He turned on the news and learned about the aftershocks. Sentence 5: Jake was calm and thought it was interesting. Choices: a. Microphone. b. Aftershock.
Output:
b