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: My husky mix recently started panting for no reason. Sentence 2: We tried everything, but nothing seemed to make her feel better. Sentence 3: Finally, we gave up and took her to the vet. Sentence 4: They ran a test for heartworms, which came back negative. Sentence 5: Eventually, they decided the fleas she's had were stressing her out. Choices: a. Panting. b. Annette.

a