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 seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Example Input: Title: first word. Sentence 1: Ida's baby was babbling. Sentence 2: Then one morning she said her first word. Sentence 3: It was Mama! Sentence 4: Ida was so proud. Choices: a. She almost cried with happiness! b. She also found a smashed centipede in the same area!
Example Output: a

Example Input: Title: Vegetables. Sentence 1: The boy ate his vegetables. Sentence 2: His mother rewarded him. Sentence 3: The boy began to expect rewards. Sentence 4: The mother stopped rewarding the boy. Choices: a. In a few months, she was no longer afraid to go outside. b. The boy refused to eat vegetables.
Example Output: b

Example Input: Title: Picking a dress. Sentence 1: Yvette was about to get married, but she needed a dress. Sentence 2: She went to the dress shop with her friends. Sentence 3: She tried on many dresses, but her friends didn't approve. Sentence 4: Finally, she put on the perfect dress. Choices: a. That was Nick's greatest and last crime. b. Her friends approved and the bought in on the spot!
Example Output:
b