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: Who directed Calhern in his role as the devious George Caswell? Passage:In 1923, Calhern left the movies, deciding to devote his career entirely to the stage, but he would later return to the screen after the advent of sound pictures. In films, He was primarily cast as a character actor, while he continued to play leading roles on the stage. He reached his peak in the early 1950s as a Metro-Goldwyn-Mayer contract player. Among Calhern's many memorable screen portrayals were Ambassador Trentino in the Marx Brothers classic Duck Soup (1933) and three diverse roles that he appeared in at MGM in 1950: a singing role as Buffalo Bill in the film version of the musical Annie Get Your Gun, as a double-crossing lawyer and sugar-daddy to Marilyn Monroe in John Huston's film noir classic The Asphalt Jungle, and his Oscar-nominated performance as Oliver Wendell Holmes in The Magnificent Yankee (re-creating his role from the Broadway stage). He was also praised for his portrayal of the title role in the John Houseman production of Julius Caesar (adapted from the Shakespeare play) in 1953, directed by Joseph L. Mankiewicz. Calhern also played the role of the devious George Caswell, the manipulative board member of Tredway Corporation in the 1954 production of Executive Suite.


a