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: Golden Detention. Sentence 1: Toby received detention for playing a prank. Sentence 2: He had to spend a one weekend clean the school playground. Sentence 3: He found a valuable golden coin during his cleaning duties. Sentence 4: Toby gave it over to the school principal. Choices: a. The principle in turn let him keep the coin. b. He said he had a hernia truss that he had to take off to urinate.
A:
b