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: Tim had a gun. Sentence 2: One day he turned his eyes away from it for a second. Sentence 3: His son grabbed it thinking it was a toy. Sentence 4: He accidentally shot Tim in the leg. Sentence 5: His wife forced him to get rid of the gun. Choices: a. Gun Accident. b. Substitute Teacher.

a