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: Al was dozing off in class. Sentence 2: He had stayed up all night. Sentence 3: He tried to hide his nap from his teacher. Sentence 4: The teacher noticed he was trying to sleep. Sentence 5: Al was scolded for falling asleep in class. Choices: a. Sam gets stung. b. Class.

b