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: Consider Input: Question: How many years after Wish You Were Here was released was The Wall released? Passage:Storm Thorgerson, who had done the majority of album covers for Pink Floyd, did the Echoes art which features recursive windows in an infinite regression as a nod to his own cover for 1969's Ummagumma, and the objects on each landscape refer to the Pink Floyd discography. For instance, there's the man on fire from Wish You Were Here, another wearing the Delicate Sound of Thunder lightbulb suit, dolls of the Atom Heart Mother cow and the Animals pig, a bike and both a brick wall and the hammers from The Wall. Eventually Thorgerson opted to make two images, with another used for the back cover. To create the idea on a photograph, various walls - which had varied measurements and angles to ensure that "nothing seemed to fit other than by eye through the lens." - were built and put in a country landscape in Sussex. Actors, props and fittings were set in and between those walls. The original design was one of two sketches submitted for Dream Theater's 1997 album Falling into Infinity, with the original being framed and hanging in the home of former Dream Theater drummer Mike Portnoy and is pointed out by Portnoy in his Hudson Music instructional drum DVD In Constant Motion.


Output: b


Input: Consider Input: Question: How many engines does the Boeing bomber that land at Taichung International Airport have? Passage:Taichung International Airport was constructed during the era of Japanese rule and was named . The United States Air Force (USAF) had been garrisoning the base with two fighter squadrons until the Sino-American Mutual Defense Treaty came into force on March 3, 1955. The airport then expanded in 1954 according to the Sino-American Mutual Defense Treaty, and later renamed Ching Chuan Kang Air Base (CCK) in memory of General Qiu Qingquan. In 1966 the American Air Force established a joint forces air-base at CCK. It was the largest air force base in the Far East at the time, allowing Boeing B-52 Stratofortress bombers to land. During the Vietnam War, CCK became a depot for the USAF. The US Military used CCK and Shuinan Airport to run many of its long-distance Vietnam, Cambodia and Laotian bombing, scouting and cargo transport runs during the Vietnam War era. This base was shut down and most American facilities were removed after U.S. established diplomatic relations with the China in 1979.


Output: b


Input: Consider 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.



Output: a