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.

Input: Consider Input: Title: Chunk. Sentence 1: Chunk was the fattest kid in school and everyone hated him. Sentence 2: Chunk even hated himself. Sentence 3: Chunk got a weird cancer and became weirdly thin. Sentence 4: All the kids made fun of him for being so skinny. Choices: a. Cal sold off everything but the chainsaw to Mike. b. Chunk decided that people were far worse than cancer.

Output: b

Input: Consider Input: Title: All About a Boy. Sentence 1: Rachael and Kristy were best friends. Sentence 2: Rachael was dating a boy named Mark. Sentence 3: Mark broke up with Rachel for no reason. Sentence 4: The next week Mark and Kristy started dating. Choices: a. Impatient Agnes ended up waiting much longer than ten minutes. b. Rachael and Kristy are no longer best friends.

Output: b

Input: Consider Input: Title: Coby's Collection. Sentence 1: Coby collects rocks. Sentence 2: Every time he goes somewhere, he brings home a pebble or stone. Sentence 3: He takes very careful care of his collection. Sentence 4: He polishes the rocks once a week. Choices: a. He felt lucky as he got a replacement. b. By the time he's four, he'll have well over one hundred.
Output: b