You will be given a definition of a task first, then some input of the task.
Given a prompt and two completions from a language model, select the completion that is the most fluent with respect to continuing the prompt. Fluency is defined by coherency and ease of understanding, not necessarily grammatical correctness. Generate either Completion A or Completion B.

Prompt: I never understood the reason for the different tracks. I just can't 
Completion A: understand why you guys want to play this. They were like "You can play some bass and stuff" which is kind of like you're playing like 
Completion B: imagine any more reason."  "The last track is just a simple song, it's just me and my guitar," continued Nadella
Output:
Completion A