You will be given a definition of a task first, then some input of the task.
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.

Context: 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) 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 Answer: Star Wars
Output:
Which of the films that Ellenshaw produced visual effects for made the most at the box office?