Question: As a child, Olga Peretyatko sand in the children's choir of a theatre that opened in what year?
Sentence (from "Olga Peretyatko"): Olga Peretyatko (Russian: Ольга Перетятько ; born 21 May 1980 in Leningrad, now Saint Petersburg) is a Russian operatic soprano.
Relevant evidence: No