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: We used to live near train tracks. Sentence 2: We could hear the horns at times. Sentence 3: I am a train buff and loved the sound. Sentence 4: We moved and I thought we were away from the trains. Sentence 5: Last week I heard train horns from a different railroad. Choices: a. Sample. b. Trains.

b