Given the task definition and input, reply with output. 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'.

Sentence 1: One of my ex coworkers had a ten year affair. Sentence 2: Her affair was recently exposed. Sentence 3: The man left her and went back to his wife. Sentence 4: Recently she posted a hotel room photo suggesting otherwise. Sentence 5: The photo has people gossiping. Choices: a. Retirement. b. Affair.
b