Q: 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'.
Context: In 2000 Liao made his debut at the Washington National Opera Link Information: In 2000 Liao made his debut at the Washington National Opera Question: How long had the Kennedy Center been standing by the year Liao made his debut at the Washington National Opera?
A:
Answer: 29