In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

[Q]: Context: They first won the belts from Sonny King and Chief Jay Strongbow Link Information: none Question: How long did Sonny King and Jay Strongbow hold their title for before Tanaka took it?
[A]: Answer: none


[Q]: Context: One of the provisions of the 1739 Treaty of Belgrade stated that Austria had to demolish all the fortifications and military and civilian buildings it has constructed during the occupation. Link Information: The Treaty of Belgrade, known as the Belgrade peace was the peace treaty signed on September 18, 1739 in Belgrade, Habsburg Kingdom of Serbia (today Serbia), by the Ottoman Empire on one side and the Habsburg Monarchy on the other Question: How many countries total were included in the Treaty?
[A]: Answer: 2


[Q]: Context: Also in June 1980, she performed at the Playboy Jazz Festival held at the Hollywood Bowl in Los Angeles. Other artists on the bill included Dizzy Gillespie, Herbie Hancock, Stéphane Grappelli, Mel Tormé, Zoot Sims, Carmen McRae and Chick Corea. Link Information: John Birks "Dizzy" Gillespie (; October 21, 1917 – January 6, 1993) Question: Who is the oldest artist to appear at the Playboy Jazz Festival in June 1980?
[A]:
Answer: Stéphane Grappelli