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: Troy worked in a submarine in the Navy. Sentence 2: He finished his job at the sonar station and went to his bunk. Sentence 3: Then he heard a loud noise above him. Sentence 4: His bunkmate had passed gas. Sentence 5: Because it was a sub, the smell lingered in the room. Choices: a. Ankles. b. Submarine.

b