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: Tom never liked his nose. Sentence 2: He decided to save up money to fix it. Sentence 3: Eventually Tom had plastic surgery. Sentence 4: Tom was pleased with the results. Sentence 5: His self esteem went up. Choices: a. Plastic Surgery. b. Lost Luggage.
a