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: Linda was making dinner. Sentence 2: She noticed that her cat hadn't come in for food. Sentence 3: She went to check on him and saw him looking lethargic. Sentence 4: She tried to comfort him but he seemed uncomfortable. Sentence 5: She immediately called her vet to make an appointment. Choices: a. The Sick Cat. b. Litter.

a