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: Dance Class. Sentence 1: Natalie was going to her first dance class. Sentence 2: She had dreamed about this day for years! Sentence 3: Her teacher invited her to put on her ballet shoes. Sentence 4: Natalie couldn't wait to learn how to dance! Choices: a. She was going to work hard to do a great job in the recital. b. But her boss congratulated her as she had found the quips funny.
Example Output: b

Example Input: Title: Henry the Hiker. Sentence 1: Henry hiked up the local hill. Sentence 2: He passed by some people and greeted them. Sentence 3: He continued hiking but then he slipped off the hill. Sentence 4: Henry landed on a giant bush and was fine. Choices: a. Nick went into full remission. b. He got up and tried to be more careful from now on.
Example Output: a

Example Input: Title: knot. Sentence 1: The man tied a knot. Sentence 2: The weather picked up. Sentence 3: The man went to check on his boat. Sentence 4: His boat was gone. Choices: a. The man realized he had tied the wrong knot. b. I had to go buy a new one.
Example Output:
b