You will be given a definition of a task first, then some input of the task.
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: My friend Sam has been taking melatonin for sleeping. Sentence 2: He said yesterday he dreamed of a pretty yellow eyed woman. Sentence 3: He said the dream was vivid and sexual. Sentence 4: I warned him about taking too much medication. Sentence 5: He claims melatonin is harmless. Choices: a. Melatonin Dreams. b. New app.
Output:
a