Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Ex Input:
Passage: Between Bingen and Bonn, the Middle Rhine flows through the Rhine Gorge, a formation which was created by erosion. The rate of erosion equaled the uplift in the region, such that the river was left at about its original level while the surrounding lands raised. The gorge is quite deep and is the stretch of the river which is known for its many castles and vineyards. It is a UNESCO World Heritage Site (2002) and known as 'the Romantic Rhine', with more than 40 castles and fortresses from the Middle Ages and many quaint and lovely country villages. Question: Where does the Middle Rhine flow between Bingen and Bonn?

Ex Output:
Rhine Gorge


Ex Input:
Passage: Oxygen presents two spectrophotometric absorption bands peaking at the wavelengths 687 and 760 nm. Some remote sensing scientists have proposed using the measurement of the radiance coming from vegetation canopies in those bands to characterize plant health status from a satellite platform. This approach exploits the fact that in those bands it is possible to discriminate the vegetation's reflectance from its fluorescence, which is much weaker. The measurement is technically difficult owing to the low signal-to-noise ratio and the physical structure of vegetation; but it has been proposed as a possible method of monitoring the carbon cycle from satellites on a global scale. Question: To monitor what event would measuring radiance from vegetation provide information?

Ex Output:
carbon cycle


Ex Input:
Passage: In 1998, the network began using a minimalist graphical identity, designed by Pittard Sullivan, featuring a small black-and-white 'ABC Circle' logo on a yellow background (promotions during this time also featured a sequence of still photos of the stars of its programs during the timeslot card as well as the schedule sequence that began each night's prime time lineup). A new four-note theme tune was introduced alongside the package, based around the network's 'We Love TV' image campaign introduced that year, creating an audio signature on par with the NBC chimes, CBS' various three-note soundmarks (including the current version used since 2000) and the Fox Fanfare. The four-note signature has been updated with every television season thereafter (though variants of it used since the 1998–99 season remain in use during the production company vanity cards shown following the closing credits of most programs). In the fall of 2015, ABC is stopped with its 1998–2002 four-note jingles for promotions and production company vanity cards following the closing credits of most of its programs over seventeen years, now it have a different and adventure-type music (with the drums of the network's four-note signature in the ending). The old four-note theme tune is still used by ABC on Demand to the beginning of the ABC show. Question: Where is the ABC four-note jingle still in use?

Ex Output:
ABC on Demand