Given the task definition and input, reply with output. 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: Xander went on a trip to Africa when he was younger. Sentence 2: He loved playing with the monkeys in the resort he stayed at. Sentence 3: Xander had always wanted to have one as a pet. Sentence 4: One day he came across an ad for a monkey for sale. Sentence 5: Xander thought about it and decided owning a monkey was a bad idea. Choices: a. Pond. b. a monkey.
b