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: Virus. Sentence 1: I was browsing the internet when a pop-up screen appeared. Sentence 2: It said I had a virus on my computer and gave me a number to call. Sentence 3: Worried that I had a virus, I immediately called the number. Sentence 4: The person who answered demanded $100 to solve my problem. Choices: a. He got rid of the virus after I paid with my credit card. b. Now they all want me to cut their hair with the Flowbee.
b