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: Cat. Sentence 1: Tom noticed the cat was acting weird. Sentence 2: He then saw something attached to her butt. Sentence 3: When he looked at it he thought it looked weird. Sentence 4: He then realized it was part plastic. Choices: a. She had eaten some plastic bags and got sick. b. Jo left the mall and went to the shoe store downtown.
Example Output: a

Example Input: Title: Merry Go Round. Sentence 1: Sally could not decide between the white horse and pink bunny. Sentence 2: Choosing the right animal on the merry go round was serious business. Sentence 3: She finally decided on the pink bunny. Sentence 4: Her grandmother realized she wanted to ride the horse as much. Choices: a. They took lots of pictures of the animals. b. So she got her a ticket for a second ride.
Example Output: b

Example Input: Title: The Flat Ball. Sentence 1: Michael was playing with his brothers in their backyard. Sentence 2: They decided they wanted to play kickball. Sentence 3: Unfortunately all of the balls they had were flat. Sentence 4: They brainstormed for a long time, trying to figure out a solution. Choices: a. She thought her vacuum did a great job. b. Finally they were able to pump the ball back up and get to playing.
Example Output:
b