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.

Ex Input:
Title: Sisterly Love. Sentence 1: Sheila was diagnosed with breast cancer six months ago. Sentence 2: After learning that she couldn't have surgery she started chemo. Sentence 3: Her sister Sharon takes her to all her appointments. Sentence 4: Last week Sheila learned the cancer had moved to her lungs. Choices: a. They thought this idea was just crazy! b. Sheila and Sharon both cried for a long time.

Ex Output:
b

Ex Input:
Title: Picking a Birthday Card. Sentence 1: Vanessa was shopping for birthday cards. Sentence 2: Nothing was quite right though. Sentence 3: She agonized over her choice, but nothing stood out. Sentence 4: Suddenly, she noticed a sparkly blue card tucked in a corner. Choices: a. Barb decided to run and grab a burger for lunch. b. She had found the perfect card for her sister!

Ex Output:
b

Ex Input:
Title: Stop the wedding. Sentence 1: Alicia was marrying Tom today. Sentence 2: She was excited to be his wife. Sentence 3: But all of the sudden someone came rushing in the door. Sentence 4: It was her ex boyfriend. Choices: a. He begged her not to marry him. b. He had short outpatient surgery to get it fixed.

Ex Output:
a