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: When I developed chest pain, I thought it was from a heavy lunch. Sentence 2: I made a few more entries on my computer and waited for it to pass. Sentence 3: Instead, I began to feel breathless as the pain moved to my shoulder. Sentence 4: I felt silly but called 911 and took an aspirin tablet while I waited. Sentence 5: I later learned it was a heart attack, and my prompt action saved me. Choices: a. Contacts. b. Better Safe Than Sorry.

b