What is the question "How do windmills work ?" asking about?
A: description

What is the question "Name of the powerful white trader in Conrad 's '' Heart of Darkness '' ?" asking about?
A: human

What is the question "How long is the border between Canada and the 48 conterminous states ?" asking about?
A: numeric

What is the question "What manufacturers are there in Texas ?" asking about?
A:
human