Given the task definition and input, reply with output. 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.

Title: Missing Parts. Sentence 1: Tom bought an open item from the store. Sentence 2: It was furniture he had to put together. Sentence 3: Tom was near finishing when he noticed some missing parts. Sentence 4: Tom returned it to the store. Choices: a. He got his money back. b. He died of a heart attack ten years later.

b