QUESTION: Generate a question with a factual answer?

ANS: When was "Russian language at the turn of the 20th-21st centuries" published?

QUESTION: Generate a question with a factual answer?

ANS: What sort of feature is created by the use of vertical elements in gallery and window tracery?

QUESTION: Generate a question with a factual answer?

ANS: What is Greece ranked in the EU in the production of marble?

QUESTION: Generate a question with a factual answer?

ANS:
What synthetic product is produced by upgraders?