Definition: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: Which of the films that Ellenshaw produced visual effects for made the most at the box office? 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.


b