Q: In this task, you're given a passage, 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'.
Passage: Harrison Ellenshaw (born Peter Ellenshaw, July 20, 1945 in Harrisburg, Pennsylvania) is an American matte painter, following his British-born father Peter Ellenshaw. He started his career at Walt Disney Studios. He later joined George Lucas's effects studio Industrial Light and Magic (ILM), where he produced many of the matte visual effects backgrounds for the films Star Wars (1977) and The Empire Strikes Back (1980). He then returned to Disney to work on the film Dick Tracy (1990), and eventually headed Disney Studio's effects department, Buena Vista Visual Effects (BVVE). He was also visual effects supervisor for Tron (1982), where he had the distinction of being the first person to have that credit in a film.
Link Information: The Empire Strikes Back was released on May 21, 1980. It received mixed reviews from critics initially but has since grown in esteem, becoming the most critically acclaimed film in the Star Wars franchise; it is now widely regarded as one of the greatest films of all time. It became the highest-grossing film of 1980 and, to date, has earned more than $538million worldwide Question: Which of the films that Ellenshaw produced visual effects for made the most at the box office?
A:
Answer: Star Wars