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

Which country is currently ruled by the Chakri dynasty that has been in power since 1782?
chakri dynasty

The rivers Axe, Brue, Cary, Parrett, eta, are in which English county?
castle cary

Which 2003 drama film, named after a painting by Dutch painter Johannes Vermeer and directed by Peter Webber, stars Scarlett Johansson, Colin Firth, Tom Wilkinson & Cillian Murphy?

peter webber