In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.

[EX Q]: Context: as the frigate RVNS Tran Binh Trong (HQ-05) and fought in the Battle of the Paracel Islands in 1974. Link Information: he Battle of the Paracel Islands was a military engagement between the naval forces of China and South Vietnam in the Paracel Islands on January 19, 1974. Answer: 1
[EX A]: How long did the Battle of the Paracel Island last for?

[EX Q]: Context: announced on Facebook that "Tropico" will be screened at the Cinerama Dome in Hollywood, California on December 4, 2013 prior to its VEVO release. Link Information: it opened November 7, 1963 Answer: 1963
[EX A]: What year was the Dome built?

[EX Q]: Context: and earned a Ph.D. in theoretical physics from the University of Illinois at Urbana-Champaign in 1986 with Anthony Leggett as his advisor, with part of his work done under the supervision of Eduardo Fradkin. Link Information: none Answer: none
[EX A]:
Which professor had been teaching at Urbana-Champaign longer when Fisher earned his Ph.D.?