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: When did Allmusic hire the critic that called Don't Look Back's riff "killer"? Passage:Billboard Magazine rated the song one of the best cuts on Don't Look Back. Greil Marcus rated the song as one of three masterpieces on Don't Look Back, along with "A Man I'll Never Be" and "Used to Bad News." Allmusic critic Tim Sendra described its riff as "killer," saying that it was similar to that in "More Than a Feeling." The New Rolling Stone Album Guide critic Paul Evans felt that "Don't Look Back" was the one song on its album that could "hold its own" on Boston's first album. Ultimate Classic Rock critic Eduardo Rivadavia similarly stated that it "met every expectation set by Boston’s nearly perfect debut." Ultimate Classic Rock critic Michael Gallucci rated it the band's 4th all time best song. AXS contributor Bill Craig similarly rated it Boston's 3rd greatest song, describing it as an "arena rock style sonic blast." Philip Booth of the Lakeland Ledger called it one "of the most-played-by-garage-band rockers of the '70s." Pete Prown and Harvey P. Newquist praised the "layers of guitar harmonies" as well as Barry Goudreau's slide guitar playing and rideout guitar solo. Ottawa Journal critic Mike Voslin rated the song as a live performance highlight.


a