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: Ralph was loved by his children at school. Sentence 2: He was a very special teacher to the kids. Sentence 3: Ralph seemed like a normal man. Sentence 4: One day at school Ralph is called to the principal's office. Sentence 5: Ralph was notified he was being arrested for child porn charges. Choices: a. Ralph's dirt secret. b. Collision.

a