You will be given a definition of a task first, then some input of the task.
Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.

Context : Statesmen of World War I is an oil on canvas painting by Sir James Guthrie, completed in 1930, shortly before Guthrie's death.
Answer : canvas
Output:
What material was used for Statesmen of World War I?