instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which was the title of the 7th and final book in the Chronicles of Narnia by C.S. Lewis?
answer:
the chronicles of narnia


question:
The Byzantine Empire is the term used since the 19th century to describe the Roman Empire of the Middle Ages, centred on its capital, where?
answer:
byzantine empire


question:
July 16, 1917 saw the death of what leader, Emperor of Russia, Grand Prince of Finland, and titular King of Poland, and his children Olga, Tatiana, Maria, Anastasia, and Alexei?
answer:

grand duchess tatiana nikolaevna of russia