In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Ex Input:
Who found that physical action cannot take on an arbitrary value?, Context: Classical statistical mechanics requires the existence of h (but does not define its value). Eventually, following upon Planck's discovery, it was recognized that physical action cannot take on an arbitrary value. Instead, it must be some multiple of a very small quantity, the "quantum of action", now called the Planck constant. Classical physics cannot explain this fact. In many cases, such as for monochromatic light or for atoms, this quantum of action also implies that only certain energy levels are allowed, and values in between are forbidden.

Ex Output:
Planck

Ex Input:
How vast is the area that GRTC serves?, Context: Local transit and paratransit bus service in Richmond, Henrico, and Chesterfield counties is provided by the Greater Richmond Transit Company (GRTC). The GRTC, however, serves only small parts of the suburban counties. The far West End (Innsbrook and Short Pump) and almost all of Chesterfield County have no public transportation despite dense housing, retail, and office development. According to a 2008 GRTC operations analysis report, a majority of GRTC riders utilize their services because they do not have an available alternative such as a private vehicle.

Ex Output:
small

Ex Input:
what is the second to last type of creature mentioned?, Context: Most birds can fly, which distinguishes them from almost all other vertebrate classes. Flight is the primary means of locomotion for most bird species and is used for breeding, feeding, and predator avoidance and escape. Birds have various adaptations for flight, including a lightweight skeleton, two large flight muscles, the pectoralis (which accounts for 15% of the total mass of the bird) and the supracoracoideus, as well as a modified forelimb (wing) that serves as an aerofoil. Wing shape and size generally determine a bird species' type of flight; many birds combine powered, flapping flight with less energy-intensive soaring flight. About 60 extant bird species are flightless, as were many extinct birds. Flightlessness often arises in birds on isolated islands, probably due to limited resources and the absence of land predators. Though flightless, penguins use similar musculature and movements to "fly" through the water, as do auks, shearwaters and dippers.

Ex Output:
shearwaters