instruction:
The goal of this task is to translate questions in Catalan into English. The requirements of the translation is that: the text must be equivalent in meaning, the text must not be ambiguous, and the text must be written as a question
question:
Quines principals ciutats de l’Europa de l’Est no van ser destruïdes per la invasió dels mongols?
answer:
In which year did Genghis Khan's grandson invade Kievan Rus'?


question:
Quin càrrec té actualment John Elway a la franquícia dels Broncos?
answer:
What role does John Elway currently have in the Broncos franchise?


question:
Què era Thomas Piketty?
answer:

Who challenges the notion of the Kuznets curve hypothesis?


