CLEAN:Rare Picasso painting to go on sale at Christie's

What cities were significant in the lives of Picasso and Hill Fernandez de Soto?

• New York and Tokyo

• London and Berlin

• Barcelona and Paris

• Madrid and Rome

In what year were the Adele Block Bauer Pictures presented?

• 2004

• 2005

• 2007

• 2006

What issue arose at the last moment regarding the Adele Block Bauer Pictures?

• The artist's identity was questioned

• The artwork was damaged

• The artwork's authenticity was doubted

• There were claims about its early provenance

How is the artwork described in terms of its market value?

• A minor piece

• A masterpiece

• An average work

• A controversial piece

What is the current market trend for artworks like the one discussed?

• Stable interest

• Masterpiece driven market

• Unpredictable market

• Declining interest