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: Books. Sentence 1: The kids loved reading. Sentence 2: They bought a big stack of books. Sentence 3: They read each one before the end of the week. Sentence 4: They wanted more! Choices: a. Beth was proud of the work she'd done. b. Their mom took them to the library to get more things to read.
Example Output: a

Example Input: Title: Comb. Sentence 1: Donald loved to comb his hair. Sentence 2: He combed it every day to look good. Sentence 3: One day, he could not find his comb. Sentence 4: Daniel searched everywhere for his comb. Choices: a. Eventually, Daniel found his comb in his bathroom. b. Once he solved it, Brown was satisfied.
Example Output: b

Example Input: Title: Street Race. Sentence 1: Andy loved street racing. Sentence 2: So he joined a local street racing group. Sentence 3: They gathered at 2AM and started racing. Sentence 4: But they were quickly seen by the cops. Choices: a. He felt very evil for betraying her trust, but he never liked her. b. Andy split up with them and made it home safely.
Example Output:
a