Teacher:Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
Teacher: Now, understand the problem? Solve this instance: Company in a courtyard behind a house (1663-1665) is an oil on canvas painting by the Dutch painter Pieter de Hooch, it is an example of Dutch Golden Age painting and is part of the collection of the Amsterdam Museum, on loan to the Rijksmuseum.
Student:
What is the surface of Company in a courtyard behind a house made of?