Question: What nationality is the director of film The Tsarevich (1929 Film)?
Sentence (from "The Tsarevich (1929 film)"): Like the 1927 operetta "Der Zarewitsch" by Franz Lehár it is based on a play by Gabriela Zapolska, inspired by the troubled relationship between Peter the Great and his son Tsarevich Alexei.
Relevant evidence: No