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: Coconut oil. Sentence 1: Cortana didn't like brushing her hair. Sentence 2: Sometimes she wouldn't brush it for days. Sentence 3: Eventually her hair got so tangled that it looked like a birds nest! Sentence 4: She heard that using coconut oil would help to detangle it. Choices: a. Two people were trampled in the evacuation. b. After one whole bottle of coconut oil her hair is now detangled.
a