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: Kyle had a lingering flu. Sentence 2: Finally his mom took him to the doctor. Sentence 3: After a chest x-ray, the doctor said Kyle had pneumonia! Sentence 4: He needed very strong medication. Sentence 5: It was very lucky Kyle had seen the doctor for treatment in time! Choices: a. The Pistol. b. Flu.
b