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 were at the beach and I had to use the bathroom. Sentence 2: I felt trapped. Sentence 3: I knew I had to use the portable ones. Sentence 4: So I held my breath and went in. Sentence 5: It was disgusting and I immediately ran out. Choices: a. Having to use a portable bathroom. b. Massive waves.

a