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.

Example Input: Title: Mistaken Identity. Sentence 1: Joe was walking down the street minding his own business. Sentence 2: All of a sudden a police officer was grabbing him. Sentence 3: The officer said he matched the description of a bank robber! Sentence 4: Joe knew it was a mistake but was still afraid. Choices: a. Fortunately he had an alibi for the time of the crime so was let go. b. It was just a big truck driving by!
Example Output: b

Example Input: Title: Field Trip. Sentence 1: I used to work in the offices of a transit authority. Sentence 2: One day I took two co workers out on a field trip. Sentence 3: We rode to a trolley car house in Mattapan, MA. Sentence 4: The mechanic there let me drive one of the trolleys in the yard. Choices: a. I was very excited and happy. b. I went home that night and made avocado ice cream and it was great!
Example Output: b

Example Input: Title: Big Stain. Sentence 1: Tom was up late. Sentence 2: His parents told him to go to sleep. Sentence 3: He decided to eat in the living room instead. Sentence 4: Tom made a big stain. Choices: a. Counseling helped him resolve this and regain the joy of living. b. He tried to hide it but got in trouble.
Example Output:
a