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: John was at work. Sentence 2: Suddenly it got dark outside. Sentence 3: He looked out the window. Sentence 4: There was some very dark rain clouds. Sentence 5: It started to rain very hard. Choices: a. The storm.. b. The Flying Pig.

a