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: Tina was pregnant. Sentence 2: She wasn't expecting a baby shower however. Sentence 3: But her sister Stacy had been planning one. Sentence 4: When she found out she was so excited. Sentence 5: It was the best moment of her life. Choices: a. It pays to hike.. b. Surprise baby shower.

b