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: Jess' cat was acting very strange. Sentence 2: He wouldn't stop scratching and rolling around. Sentence 3: Jess thought it was fleas so took him to the vets. Sentence 4: The vet had a look but couldn't find any fleas. Sentence 5: After further tests, the vet figured that he was allergic to his food. Choices: a. Special requirement cat. b. The Tree..

a