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'.
Q: Sentence 1: Robert always wanted a house full of sons. Sentence 2: His wife Lucy even had the names picked out for their future sons. Sentence 3: They were ecstatic to be expecting triplet boys. Sentence 4: On the day of the babies arrival they were told a mistake was made. Sentence 5: Instead of boys they were having all girls. Choices: a. Tunnel. b. Full House.
A:
b