You will be given a definition of a task first, then some input of the task.
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: Healthy Habits. Sentence 1: Andrew 's doctor told him to change up his diet to lose weight. Sentence 2: He said just switch out a few food items here and there. Sentence 3: So Andrew switched out chips for nuts and pop for water. Sentence 4: The next doctor's visit the doctor said Andrew was much better. Choices: a. This motivated Andrew to keep making healthy habits. b. Tim was so glad he had found Mo!
Output:
a