Q: A Doll's House (Bokmal: Et dukkehjem; also translated as A Doll House) is a three-act play written by Norway's Henrik Ibsen. It premiered at the Royal Theatre in Copenhagen, Denmark, on 21 December 1879, having been published earlier that month. The play is set in a Norwegian town circa 1879.

Answer this question: where was a doll's house first performed?
A: the Royal Theatre in Copenhagen , Denmark
Explain how we arrive at this answer:
Explanation: To answer the above question, the relevant sentence is: It premiered at the Royal Theatre in Copenhagen, Denmark, on 21 December 1879, having been published earlier that month.