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: Billy went to the zoo. Sentence 2: He got to see lots of animals. Sentence 3: He really liked the bears. Sentence 4: The tigers scared him. Sentence 5: Billy looks forward to going again. Choices: a. Trip to the Zoo. b. Router for Sister-in-Law.

a