Question: "Purple Rain-Union" is the sixth episode of the fourth season of the animated comedy series "Bob's Burgers", it aired on Fox in the United States on which date, the title of the episode is a reference to the song, film, and album "Purple Rain" by Prince?
Sentence (from "My Big Fat Greek Bob"): "My Big Fat Greek Bob" is the fourth episode of the fourth season of the animated comedy series "Bob's Burgers" and the overall 49th episode, and is written by Scott Jacobson and directed by Don MacKinnon.
Relevant evidence: No