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: Forgotten wallet.. Sentence 1: John invited Carl for a beer. Sentence 2: They had a nice time. Sentence 3: They drank and talk. Sentence 4: When they wanted to leave, John found out he had forgotten his wallet. Choices: a. Carl had to pay for a beer. b. They repaired it for me right then.
b