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: I knew he was stalking me. Sentence 2: My friends and family started contacting me. Sentence 3: They asked if I was okay. Sentence 4: They said he was making cryptic comments about my safety. Sentence 5: I told them I was fine but he was crazy. Choices: a. head. b. Knowledge.

b