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.
Q: Title: Mark goes to the dentist. Sentence 1: Mark went to the dentist for the first time in two years. Sentence 2: He had a cleaning, exam and x-rays done by the dentist. Sentence 3: After the exam, the dentist told Mark he had three cavities. Sentence 4: Mark was relieved that was all he had. Choices: a. He made an appointment for the fillings and went home happy. b. Clark goes to the doctor and they tell him he has scabies.
A:
b