user: Q: Information:  - Meltwater is water released by the melting of snow or ice, including glacial ice, tabular icebergs and ice shelves over oceans. Meltwater is often found in the ablation zone of glaciers, where the rate of snow cover is reducing. Meltwater can be produced during volcanic eruptions, in a similar way in which the more dangerous lahars form.  - A bellows or pair of bellows is a device constructed to furnish a strong blast of air. The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtight cavity which can be expanded and contracted by operating the handles, and fitted with a valve allowing air to fill the cavity when expanded, and with a tube through which the air is forced out in a stream when the cavity is compressed. It has many applications, in particular blowing on a fire to supply it with air.  - A stream is a body of water with a current, confined within a bed and banks. Depending on its location or certain characteristics, a stream may be referred to as a "bayou", "beck", "branch", "brook", "burn", "creek", "crick", "ghyll", "gill", "kill", "lick", "mill race", "race", "rill", "river", "rivulet", "run", "runnel", "streamage", "syke", or "wash".  - The pipe organ is a musical instrument that produces sound by driving pressurized air (called "wind") through organ pipes selected via a keyboard. Because each pipe produces a single pitch, the pipes are provided in sets called "ranks", each of which has a common timbre and volume throughout the keyboard compass. Most organs have multiple ranks of pipes of differing timbre, pitch, and volume that the player can employ singly or in combination through the use of controls called stops.  - A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases a river flows into the ground and becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as stream, creek, brook, rivulet, and rill. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and northeast England, and "beck" in northern England. Sometimes a river is defined as being larger than a creek, but not always: the language is vague.  - In music, timbre (, also known as tone color or tone quality from psychoacoustics) is the perceived sound quality of a musical note, sound, or tone that distinguishes different types of sound production, such as choir voices and musical instruments, such as string instruments, wind instruments, and percussion instruments, and which enables listeners to hear even different instruments from the same category as different (e.g. a viola and a violin).   - An iceberg or ice mountain is a large piece of freshwater ice that has broken off a glacier or an ice shelf and is floating freely in open water. It may subsequently become frozen into pack ice (one form of sea ice). As it drifts into shallower waters, it may come into contact with the seabed, a process referred to as seabed gouging by ice. Almost 91% of an iceberg is below the surface of the water.   - A waterfall is a place where water flows over a vertical drop or a series of drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf.   - An ice shelf is a thick floating platform of ice that forms where a glacier or ice sheet flows down to a coastline and onto the ocean surface. Ice shelves are only found in Antarctica, Greenland, Canada and the Russian Arctic. The boundary between the floating ice shelf and the grounded (resting on bedrock) ice that feeds it is called the grounding line. The thickness of ice shelves ranges from about 100 to 1000 meters.  - The water organ or hydraulic organ ( Greek :  ) ( early types are sometimes called hydraulis , hydraulos , hydraulus or hydraula ) is a type of pipe organ blown by air , where the power source pushing the air is derived by water from a natural source ( e.g. by a waterfall ) or by a manual pump . Consequently , the water organ lacks a bellows , blower , or compressor . On the water organ , since the 15th century , the water is also used as a source of power to drive a mechanism similar to that of the Barrel organ , which has a pinned barrel that contains a specific song to be played . The hydraulis in ancient Greek is often imagined as an automatic organ , but there is no source evidence for it . One of the oldest automatic instruments known is the automatic flute player invented by Ban Ms brothers in 9th - century Arabia .    What object entity has the relation of 'subclass of' with the subject 'water organ'?   Choices: - bag  - body of water  - burn  - choir  - cover  - device  - edge  - england  - geographic location  - glacier  - ice  - keyboard  - lake  - leather  - line  - mountain  - music  - musical instrument  - natural  - organ  - pipe  - pitch  - platform  - player  - process  - production  - rate  - river  - series  - single  - snow  - stream  - surface  - tube  - type  - violin  - volume  - water  - watercourse
A: musical instrument


Q: Information:  - SafeSearch is a feature of Google Search that acts as an automated filter of pornography and potentially offensive content.  - Pornography (often abbreviated to porn or porno in informal language) is the portrayal of sexual subject matter for the purpose of sexual arousal. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, writing, film, video, and video games. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. The primary subjects of pornographic depictions are pornographic models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. If dramatic skills are not involved, a performer in a porn film may also be called a model.  - Google Search, commonly referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most-used search engine on the World Wide Web, handling more than three billion searches each day. it is the most used search engine in the US with 64.0% market share.  - KidRex is a child - safe search engine powered by Google Custom Search . The site utilizes Google SafeSearch and maintains its own database of inappropriate websites and keywords . The site has a colorful hand - drawn crayon and colored marker design . TIME put KidRex on its list of the top 50 websites of 2013 and compared it to Google .    What object entity has the relation of 'instance of' with the subject 'kidrex'?   Choices: - drawing  - feature  - film  - filter  - language  - market  - matter  - may  - painting  - pornography  - sculpture  - search engine  - share  - sound  - web search engine


assistant: A: web search engine