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: Nancy just had a baby. Sentence 2: She feels out of shape. Sentence 3: One day she started to exercise. Sentence 4: It was very difficult. Sentence 5: Nancy feels good about her decision to get in shape. Choices: a. Baby weight. b. The Sad Book.

a