This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

During the war years Universal did have a co-production arrangement with producer Walter Wanger and his partner, director Fritz Lang, lending the studio some amount of prestige productions. Universal's core audience base was still found in the neighborhood movie theaters, and the studio continued to please the public with low- to medium-budget films. Basil Rathbone and Nigel Bruce in new Sherlock Holmes mysteries (1942–46), teenage musicals with Gloria Jean, Donald O'Connor, and Peggy Ryan (1942–43), and screen adaptations of radio's Inner Sanctum Mysteries with Lon Chaney, Jr. (1943–45). Alfred Hitchcock was also borrowed for two films from Selznick International Pictures: Saboteur (1942) and Shadow of a Doubt (1943).
Who was the directorial partner of Walter Wanger?