Question: In Frozen Fever, a short animated sequel to the hit movie, Queen Elsa of Arendelle organizes a party to celebrate whose birthday?
Sentence (from "Frozen Fever"): It is a sequel to the 2013 feature film "Frozen", and tells the story of Anna's birthday party given by Elsa with the help of Kristoff, Sven, and Olaf.
Relevant evidence: Yes