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: Laurel is pregnant. Sentence 2: She is very nervous to find out the sex of the baby. Sentence 3: Her and her husband already have 3 boys. Sentence 4: Laurel plans an ultrasound to find out the baby's sex. Sentence 5: She finds out she is having a girl and is very excited and relieved. Choices: a. New Baby. b. Giggling.
a