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: A man installed a security system. Sentence 2: His dog kept setting it off. Sentence 3: He asked for professional help. Sentence 4: They moved some sensors. Sentence 5: The dog did not set off the alarm again. Choices: a. Security. b. nuts.

a