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.

Example Input: Title: Mint. Sentence 1: Katherine loved to chew on mints. Sentence 2: She loved having a fresh breath. Sentence 3: One day, Katherine ran out of mints. Sentence 4: She had to quickly run to the store and buy more. Choices: a. Then, Katherine was able to keep her breath fresh for the day. b. Finally, he rushed to the store and bought more eggs.
Example Output: a

Example Input: Title: Poor Toby. Sentence 1: Toby liked hanging out with his friends at night. Sentence 2: One night, a friend brought a hot girl over. Sentence 3: Toby had met her once before and kind of liked her. Sentence 4: Unfortunately, Toby's girlfriend noticed and yelled at him. Choices: a. Ben called the boy's parents. b. She wasn't ever invited over again.
Example Output: b

Example Input: Title: Apple Tree. Sentence 1: Mike told Sally there was a apple tree down the street. Sentence 2: Sally wanted me to go with her to find the apple tree. Sentence 3: I told Sally that Mike was just playing with her. Sentence 4: Sally went to look for the apple tree any way. Choices: a. When Sally returned she was sad there was no apple tree. b. He felt it was a strange but entertaining experience.
Example Output:
a