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 seamlessly connects with the rest of the story, indicating your choice as 'a' or 'b'. If both sentences are plausible, pick the one that makes more sense.

Title: Medical Students. Sentence 1: Phillip was in medical school listening to a lecture. Sentence 2: He started looking out the window and his mind wandered. Sentence 3: He awoke in an operating room on the table. Sentence 4: In panic, he jumped up thinking he was being operated on. Choices: a. His fellow students laughed and explained it was just a prank. b. Bill proposed on the beach on New Year's Day.
a