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: The sky was dark and cloudy. Sentence 2: It started to rain. Sentence 3: Tom ran towards under a tree for shelter. Sentence 4: Lightning struck the tree. Sentence 5: Tom was lucky to be alive. Choices: a. The rain. b. An Ironic Interlude.

a