Definition: In this task, you're given the title of a five-sentence story, the first four sentences, and two options for the fifth sentence as a and b. Your job is to pick the sentence option that seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.
Input: Title: guinea pigs. Sentence 1: I used to own a guinea pig when i was in grade school. Sentence 2: I started having only one guinea pig. Sentence 3: Then i realized she need a companion so she won't get sad. Sentence 4: So i brought one male guinea pig. Choices: a. Until they multiplied and now i have eight guinea pigs. b. In the end she had to wait until the food reached her stomach.
Output:
a