Generate a correct and concise answer for the question based on the words in the context.

Context : Saint Ambrose barring Theodosius from Milan Cathedral is a 1619--1620 painting by Anthony van Dyck, now in the National Gallery in London. 
Question : What is the name of the place where Saint Ambrose barring Theodosius from Milan Cathedral can be found?
National Gallery

Context : Rear Admiral Charles Stillman Sperry (3 September 1847 -- 1 February 1911) was an officer in the United States Navy. 
Question : Which military did Charles Stillman Sperry serve with?
United States Navy

Context : The Mystery Road is a 1921 British drama film directed by Paul Powell. 
Question : The director of The Mystery Road is what?

Paul Powell