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: Mark was running down the street. Sentence 2: He tripped on a branch on the ground. Sentence 3: He scratched up his arms and legs in the fall. Sentence 4: He walked home in pain. Sentence 5: He rubbed some disinfectant on his wounds in the bathroom. Choices: a. Fallen Runner. b. Motorcycle.

a