Problem: Poultry:

Poultry (/ˌpoʊltriː/) are domesticated birds kept by humans for the eggs they produce, their meat, their feathers, or sometimes as pets. These birds are most typically members of the superorder Galloanserae (fowl), especially the order Galliformes (which includes chickens, quails and turkeys) and the family Anatidae, in order Anseriformes, commonly known as "waterfowl" and including domestic ducks and domestic geese. Poultry also includes other birds that are killed for their meat, such as the young of pigeons (known as squabs) but does not include similar wild birds hunted for sport or food and known as game. The word "poultry" comes from the French/Norman word poule, itself derived from the Latin word pullus, which means small animal.

What is the significance of poultry in the lives of humans?
---
A: kept by humans for the eggs they produce, their meat, their feathers, or sometimes as pets.


Problem: Web browser:

The primary purpose of a web browser is to bring information resources to the user ("retrieval" or "fetching"), allowing them to view the information ("display", "rendering"), and then access other information ("navigation", "following links").

What is the main use of a browser?
---
A: to bring information resources to the user


Problem: Transistor:

BJTs have three terminals, corresponding to the three layers of semiconductor—an emitter, a base, and a collector. They are useful in amplifiers because the currents at the emitter and collector are controllable by a relatively small base current. In an n–p–n transistor operating in the active region, the emitter–base junction is forward biased (electrons and holes recombine at the junction), and electrons are injected into the base region. Because the base is narrow, most of these electrons will diffuse into the reverse-biased (electrons and holes are formed at, and move away from the junction) base–collector junction and be swept into the collector; perhaps one-hundredth of the electrons will recombine in the base, which is the dominant mechanism in the base current. By controlling the number of electrons that can leave the base, the number of electrons entering the collector can be controlled. Collector current is approximately β (common-emitter current gain) times the base current. It is typically greater than 100 for small-signal transistors but can be smaller in transistors designed for high-power applications.

What controls how many electrons are injected into the base region?
---
A: unanswerable


Problem: Post-punk:

The term "post-punk" was first used by journalists in the late 1970s to describe groups moving beyond punk's sonic template into disparate areas. Many of these artists, initially inspired by punk's DIY ethic and energy, ultimately became disillusioned with the style and movement, feeling that it had fallen into commercial formula, rock convention and self-parody. They repudiated its populist claims to accessibility and raw simplicity, instead seeing an opportunity to break with musical tradition, subvert commonplaces and challenge audiences. Artists moved beyonds punk's focus on the concerns of a largely white, male, working class population and abandoned its continued reliance on established rock and roll tropes, such as three-chord progressions and Chuck Berry-based guitar riffs. These artists instead defined punk as "an imperative to constant change", believing that "radical content demands radical form".

How many chords are never used in punk music?
---
A:
unanswerable