Definition: Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Positive Example 1 -
Input: Who was the first American President?
Output: president of the united states

Positive Example 2 -
Input: The Dutch duo of Ray Slijngaard and Anita Dels, who had 8 top ten hits in the 90s, were better known by what name?
Output: anita doth

Negative Example 1 -
Input: Anna Smashnova played which sport professionally until 2007?
Output: sport

Negative Example 2 -
Input: Rob Davis, Les Gray, Dave Mount and Ray Stiles are members of which pop group?
Output: david

Now complete the following example -
Input: 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?

Output: grand duchess tatiana nikolaevna of russia, grand duchess maria nikolaevna of russia, alexey, alexei nikolaevich, tsarevich of russia