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: I heard a strange noise outside my window. Sentence 2: I remember hearing that same noise a year ago. Sentence 3: I went outside to investigate. Sentence 4: There were two deer in my yard, mating. Sentence 5: They were the ones who were making that noise. Choices: a. Noise. b. Brand.

a