You will be given a definition of a task first, then some input of the task.
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: A mission. Sentence 1: Ken had been given a special assignment at work. Sentence 2: He had to travel from city to city preparing displays. Sentence 3: He worked sixty hours plus drive time in one week. Sentence 4: He completed the work as required. Choices: a. His boss made sure he was given a bonus for his dedication. b. The man got frustrated but I could tell he enjoyed the poems.
Output:
b