Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
One example: Who was the first American President?
Solution is here: president of the united states
Explanation: The question talks about the president of the USA.

Now, solve this: June 4, 1723 saw the birth, in Kirkcaldy, Scotland, of what social philosopher and pioneer of economics, who wrote such weighty tomes as The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations?
Solution:
the wealth of nations