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: Simon had just lost a tooth that day. Sentence 2: He was very proud and put it under his pillow. Sentence 3: At night, he faked to be asleep to catch the tooth fairy. Sentence 4: When he saw his mom slip money under his pillow, he smiled. Sentence 5: So the mystery was solved: his mother was the tooth fairy! Choices: a. Jack cheats. b. Tooth fairy.

b