Given the task definition and input, reply with output. 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: Gene Pool. Sentence 1: Gene had lots of friends who were wealthy. Sentence 2: All of his friends had swimming pools at their house, but Gene didn't. Sentence 3: He often wondered whether his friends appreciated their pools. Sentence 4: He asked his friend Dave, who said he never really used his pool. Choices: a. Gene felt encouraged to work hard and appreciate everything he has. b. Joey is no longer able to borrow his parents' car.
b