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 : Gemeinhardt manufactures the flute components (headjoint, body, footjoint, keys) in Elkhart, Indiana USA then sends them to Angel Industries to assemble them. 
Question : What is the product of Gemeinhardt?
flute

Context : The Bullet is Not for Firing is the fourth episode of the third series of the British comedy series Dad's Army that was originally transmitted on Thursday 2 October 1969. 
Question : What series is the episode The Bullet is Not for Firing part of?

Dad's Army