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: The dog's nose prodded against her left thigh. Sentence 2: She looked down and smiled. Sentence 3: Then she felt concerned. Sentence 4: The nose had been very warm and dry. Sentence 5: She took the dog to the vet, where she got a clean bill of health. Choices: a. Nose. b. Apartment.

a