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: Kia signed up for a Secret Santa program at work. Sentence 2: She ended up drawing a friend's name. Sentence 3: But she had no idea who had gotten her name. Sentence 4: All week she received lovely gifts. Sentence 5: She was surprised when she discovered it was her boss all along! Choices: a. Flat Tire. b. Secret Santa.

b