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: THYROIDECTOMY. Sentence 1: Hilda noticed a lump in her neck. Sentence 2: She scheduled an appointment with her doctor. Sentence 3: The doctor performed a biopsy on her lump. Sentence 4: The test was positive for thyroid cancer. Choices: a. Now I feel terrible that I couldn't give him more. b. A surgeon removed the entire thyroid.
a