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: Polly was pregnant and very sore from it. Sentence 2: She couldn't sleep one night from her back hurting. Sentence 3: She decided to take a bath to make her feel sleepy. Sentence 4: To her delight the hot water soothed her pain well. Sentence 5: Soon she felt comfy enough to climb into bed and sleep. Choices: a. The Souvenir. b. Pain Relief in the Tub.

b