Instructions: 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: Jack had been an only child for six years. Sentence 2: Suddenly his parents decided to have another baby. Sentence 3: He was not ready. Sentence 4: They announced he would be a big brother. Sentence 5: Jack found out he was having a sister and was not happy. Choices: a. Dress Code. b. Baby sister.
Output:
b