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: Undiagnosed. Sentence 1: Clara felt unwell so she visited the doctor. Sentence 2: The doctor couldn't find anything wrong. Sentence 3: She visited many other doctors and none could find anything wrong. Sentence 4: She continued to get sicker and sicker and wasted away. Choices: a. Next time I go to the hospital I will look for the courage again. b. She died of an unknown illness.
a