Task: Question Generation
Input (English): Context : Rolf Lidberg Jonas (May 26, 1930 in Järkvissle, Sweden -- 15 February 2005) was a Swedish artist and botanist, best known for his watercolor paintings and books with paintings of trolls depicting their life near Sweden's Indal river. 
Answer : 15 February 2005
Output (English): What was the date of death of Rolf Lidberg?