Instructions: 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: Tom was on vacation. Sentence 2: He noticed the water receded a lot further than normal. Sentence 3: Once he realized what was happening the wave had come back. Sentence 4: Tom was swept away with tons of other debris. Sentence 5: His body was never recovered. Choices: a. The Tsunami. b. Stolen bag.
Output:
a