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: Pim wanted to go horseback riding. Sentence 2: He had never even petted a horse before. Sentence 3: Pim's friends told him it was not a fun thing to do. Sentence 4: Pim defied their nay-saying and booked a lesson anyway. Sentence 5: Pim had a great time and mentally devalued his friends' advice. Choices: a. Carrots instead of chips. b. Equine.

b