In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Second most listened to artist on spotify 2018?
Austin Richard Post

What does ncis stand for in law enforcement?
Naval Criminal Investigative Service

Who sings the song mama don't let your babies grow up to be cowboys?

Ed Bruce