Q: 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.
Title: Dirty Fan. Sentence 1: The man turned on the fan. Sentence 2: The fan made a weird noise. Sentence 3: He turned the fan off. Sentence 4: He looked inside the fan. Choices: a. He found that the fan was clogged with dust. b. He was all set for vacation!
A:
b