Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Ex Input:
Oedipus and the Sphinx is an 1864 oil on canvas painting by Gustave Moreau that was first exhibited at the French Salon of 1864 where it was an immediate success.

Ex Output:
What is the surface of Oedipus and the Sphinx made of?

Ex Input:
''Wolves Beyond the Border'' is one of the original stories by Robert E. Howard about Conan the Cimmerian, a fragment begun in the 1930s but not finished or published in Howard's lifetime.

Ex Output:
Who was Wolves Beyond the Border written by?

Ex Input:
Catherine Antonovna of Brunswick-Luneburg (1741--1807), daughter of Duke Anthony Ulrich of Brunswick and Grand Duchess Anna Leopoldovna of Russia.

Ex Output:
Who was Catherine Antonovna of Brunswick's mother?