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.
Q: Title: Dog and Vet. Sentence 1: David noticed his dog was licking his chops non stop. Sentence 2: He looked at the dog's mouth and there was a bump on his gums. Sentence 3: David took his dog to the vet. Sentence 4: The vet gave David some treatment pills for the dog. Choices: a. That day she learned that breaking the law usually doesn't pay. b. Within a week the dog was back to normal.
A:
a