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 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: The Pregnant Wife. Sentence 1: Fred's wife was very pregnant. Sentence 2: He got a call at work one day saying she was in labor. Sentence 3: Fred told his boss he was leaving and jumped in his car. Sentence 4: Fred rushed to the hospital to meet his wife. Choices: a. Gary found out the strange man he didn't knew was his friend. b. He walked into the room to find his wife and healthy newborn son.
b