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: Unpleasant violin.. Sentence 1: My sister was practicing the violin in our house. Sentence 2: It sounded like a car wreck. Sentence 3: I have to put ear plugs in to drain out the noise. Sentence 4: I didn't want to hurt my sister's feelings. Choices: a. Dan laughed at his memories of music from the 80's. b. So I never asked her to stop.
a