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: Gene Siskel of the Chicago Tribune gave the film 3.5 stars out of 4 and praised Rip Torn for "a brilliantly controlled performance. Link Information: Hersey's reference assisted him in gaining a job at the Chicago Tribune in 1969. Question: When did Gene Siskel start working for the Chicago Tribune?
[A]: Answer: 1969

[Q]: Context: An excited Bart comes home from school and shows Homer and Marge his delayed entry program form. Link Information: he is voiced by Julie Kavner and first appeared on television in The Tracey Ullman Show short "Good Night" on April 19, 1987 Question: Who are the voice actors who play the roles of Homer and Marge?
[A]: Answer: Julie Kavner

[Q]: Context: When King Sebastian of Portugal died, the throne passed to his uncle, Henry of Portugal Link Information: Sebastian ( ; 20 January 1554 4 August 1578) was King of Portugal from 11 June 1557 to 4 August 1578 Question: How did the reign of the king prior to Henry of Portugal last?
[A]:
Answer: 21