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: Game Winning Free Throws. Sentence 1: Tim played for his high school basketball team. Sentence 2: At the end of one game, Tim received a pass near the basket. Sentence 3: As Tim tried to shoot a layup, he was fouled by a defender. Sentence 4: Tim had to shoot two free throw attempts. Choices: a. Tim made both free throws and his team won the game. b. Her mother was refunded for the classes she didn't take.
Example Output: b

Example Input: Title: Surgery. Sentence 1: Our niece had day surgery last week. Sentence 2: She had some skin tumors removed. Sentence 3: She had a biopsy months ago and just had the procedure done. Sentence 4: We sent her get well flowers. Choices: a. She emailed a thank you note. b. He won a talent show at school.
Example Output: b

Example Input: Title: The Mechanic's son. Sentence 1: Mathias was born under difficult circumstances, his dad was a legend. Sentence 2: He was a revolutionary mechanic who put their hometown on the map. Sentence 3: There was a lot of pressure for Mathias to become great like his dad. Sentence 4: He became a mechanic but unlike his dad he did this at the age of 17. Choices: a. By 25 he was a legend and went on to surpass even his father. b. Phil's problems followed him so not much has changed in his life.
Example Output:
b