Question: In what year was the number one single from Rihanna that was featured on Now That's What I Call Music! 38 released?
Sentence (from "Now That's What I Call Music! 38 (U.S. series)"): The album features six tracks that reached number one on the "Billboard" Hot 100: "Born This Way", "S&M", "Hold It Against Me", "Grenade", "E.T." and "Rolling in the Deep".
Relevant evidence: Yes