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: I couldn't afford to spend much money. Sentence 2: I knew my son loved pizza. Sentence 3: I looked for a cheap pizza he would eat. Sentence 4: Luckily I found some pizza on sale. Sentence 5: It was called a party pizza, and he loved it. Choices: a. Party Pizza. b. Hidden Treasure.

a