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: They Go Quickly!. Sentence 1: Tom bought a dozen donuts to share with his co-workers. Sentence 2: Tom got to work first, switching on the lights and coffee maker. Sentence 3: Tom laid out the box of donuts on the conference room table. Sentence 4: Tom went to check on the donuts about an hour later. Choices: a. After we cooked, we fed her dog barbecue chicken. b. At that point, the donuts were all gone!
Output:
a