Definition: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it, i.e., the proper nouns in the passage. Your job is to determine whether information from more than one term is needed to answer the question. Indicate your choice as `a` for Yes or `b` for No.
Input: Question: How many episodes of Buffy the Vampire Slayer did Yulin appear in? Passage:On television, Yulin appeared in  in the episode "Duet". During the second season of the TV series 24, he played the Director of the National Security Agency, Roger Stanton. He was nominated for a 1996 Emmy for his portrayal of crime boss Jerome Belasco in the sitcom Frasier. In the series Buffy the Vampire Slayer, he played Quentin Travers, head of the Watchers' Council. Yulin also appeared in Season 3 of Entourage in the episode "Return of the King" as studio head Arthur Gadoff. In 2009, he performed in The People Speak, a documentary feature film that uses dramatic and musical performances of the letters, diaries, and speeches of everyday Americans, based on historian Howard Zinn's A People's History of the United States. In 2010 he appeared in the AMC series Rubicon.


a