You will be given a definition of a task first, then some input of the task.
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'.

Sentence 1: They were driving the car and thought they saw a dog on the roadside. Sentence 2: They stopped the car and backed up to see if it was ok. Sentence 3: It looked like a golden retriever laying on his side. Sentence 4: But when they got closer they realized the truth. Sentence 5: It was an old rolled up carpet that was lying there instead. Choices: a. carpet dog. b. Summer Vacation.
Output:
a