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 does not connect with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes less sense.

Example Input: Title: Zoo. Sentence 1: Alejandro has never been to a zoo. Sentence 2: His boyfriend surprised him to a trip to the zoo on his birthday. Sentence 3: Alejandro got to see so many animals he has never seen in person. Sentence 4: His favorite animals were the otters and elephants. Choices: a. Now he can take his dog out for a long time. b. Alejandro cannot wait to go again.
Example Output: a

Example Input: Title: Better Cardio. Sentence 1: Tom constantly ran out of breath. Sentence 2: He decided to fix it by joining a marathon. Sentence 3: Tom trained hard for it every day. Sentence 4: He was able to finish it when the day came. Choices: a. Tom's cardio improved a great deal. b. His dog was licking his lips and chewing pieces of food.
Example Output: b

Example Input: Title: Wheel. Sentence 1: Anna was given her cousin's hamster when her cousin got sick of it. Sentence 2: She decided to give it a bigger tank and a happier home. Sentence 3: The first thing she did was get it an exercise wheel. Sentence 4: Immediately, the hamster started running on it happily. Choices: a. It didn't rain after all, so we went back outside! b. Anna was glad she'd given the hamster some entertainment!
Example Output:
a