In this task, you're given a passage, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

[EX Q]: Passage: As designed in 1931, the He 46 was a two-seat sesquiplane of mixed construction. The upper wing was swept back 10°. This is a common trick when a change in an aircraft's design moves the center of gravity to the rear; rather than moving the whole wing back to counter for the shift, it is easier to simply angle the wings back slightly, which requires very little change to the basic design, or even the overall structure of the wing. (The similarly angled wings on the Fairey Swordfish are due to just such a mid-program change to the weight distribution of the aircraft.) The tailplane was mounted high and braced by struts. The undercarriage was fixed, and the tail was fitted with a skid rather than a wheel. The He 46 prototype first flew in late 1931; its flight characteristics were good, but design improvements were incorporated. The small lower wing was removed, while the mainplane was increased in area by 22% and braced to the fuselage, transforming the He 46 into a parasol-wing monoplane. A more powerful engine was added to the second prototype, and a single 7.92 mm (.312 in) MG 15 machine gun for the rear seat was added to the third prototype.
 Link Information: he World War II MG 15 was used in nearly all Luftwaffe aircraft with a flexible-mount defensive position. Question: What other planes were fitted with the MG 15?
[EX A]: Answer: nearly all Luftwaffe aircraft with a flexible-mount defensive position

[EX Q]: Passage: Free-agent goaltender Jeff Hackett was signed from the Boston Bruins to replace Roman Cechmanek and challenge backup Robert Esche for the number one spot in 2003–04, but Hackett was forced to retire in February due to vertigo. During the course of the season, serious injuries suffered by both Jeremy Roenick (broken jaw) and Keith Primeau (concussion) in February forced the Flyers to trade for the Chicago Blackhawks' Alexei Zhamnov, who filled in well and kept the Flyers afloat. Esche entrenched himself as starter and remained in that position even after the Flyers re-acquired Sean Burke from the Phoenix Coyotes, as the Flyers clinched the Atlantic Division title over the New Jersey Devils on the last day of the season.
 Link Information: none Question: What are the symptoms of the condition that forced Hackett to retire?
[EX A]: Answer: none

[EX Q]: Passage: In 1999 Solaris unveiled its first city bus of the Urbino family – the Solaris Urbino 12. The articulated model Solaris Urbino 18 had its début the same year. In subsequent years the city bus range was broadened, as new models were added, initially these were conventionally fuelled vehicles. In 2002, Solaris presented a new version of the Urbino, the so-called 2nd generation. Two years later, in 2004, the third generation of the Urbino had its première. In 2006, at the IAA Nutzfahrzeuge trade fair in Hanover, Solaris Bus & Coach displayed a third generation bus which was also the first of its hybrid models, the Solaris Urbino 18 Hybrid created in collaboration with US firms Alisson Transmission and Cummins. It was the first serially produced hybrid bus in the world. As a result, Solaris joined European leaders of eco-friendly public transport technologies. Krzysztof Olszewski, founder of Solaris Bus & Coach, said at that time that: ”Diesel has died, long live electricity!”. The first fully electric bus, the Solaris Urbino 8,9 LE electric, was unveiled in 2012. Even though there were no electric vehicles of the Solaris brand before, this particular bus is part of the third generation Urbino family, because it served as the basis for this model. Initially, the range of the vehicle was merely , however, with time, thanks to technological progress, the achievable range increased. The vehicle was tested among others in Poznań, Cracow and Warsaw. The first buyer of that electric Solaris bus was an Austrian operator, from Klagenfurt. Vehicles of that type were also the first electric buses in Poland used by a public transport operator; in 2014, two of these buses made it to the city of Ostrołęka. 2012 saw the première of the electric city bus Solaris Urbino 12 electric which quickly became a bestseller, whereas its fourth generation version was crowned Bus of the Year 2017.
 Link Information: none Question: How many cylinders was the engine of the Urbino 12?
[EX A]:
Answer: none