Q:Information: - A television channel is a physical or virtual channel over which a television station or television network is distributed. For example, in North America, "channel 2" refers to the broadcast or cable band of 54 to 60 MHz, with carrier frequencies of 55.25MHz for NTSC analog video (VSB) and 59.75MHz for analog audio (FM), or 55.31MHz for digital ATSC (8VSB). Channels may be shared by many different television stations or cable-distributed channels depending on the location and service provider. - Terrestrial television or broadcast television is a type of television broadcasting in which the television signal is transmitted by radio waves from the terrestrial (Earth based) transmitter of a television station to a TV receiver having an antenna. The term is more common in Europe, while in North America it is referred to as broadcast television or sometimes over-the-air television (OTA). The term "terrestrial" is used to distinguish this type from the newer technologies of satellite television (direct broadcast satellite or DBS television), in which the television signal is transmitted to the receiver from an overhead satellite, and cable television, in which the signal is carried to the receiver through a cable. - A television station is a business, organisation or other enterprise, such as an amateur television (ATV) operator, that transmits (broadcasts) content over terrestrial television. A television transmission can occur via analog television signals or, more recently, via digital television signals. Broadcast television systems standards are set by the government, and these vary around the world. Television stations broadcasting over an analog system were typically limited to one television channel, but digital television enables broadcasting via subchannels as well. The term "television station" is normally applied to terrestrial television stations, and not to cable television or satellite television broadcasting. - Amateur television (ATV) is the transmission of broadcast quality video and audio over the wide range of frequencies of radio waves allocated for radio amateur (Ham) use. ATV is used for non-commercial experimentation, pleasure and public service events. Ham TV stations were on the air in many cities before commercial television stations came on the air. Various transmission standards are used, these include the broadcast transmission standards of NTSC in North America and Japan, and PAL or SECAM elsewhere, utilizing the full refresh rates of those standards. ATV includes the study of building of such transmitters and receivers, and the study of radio propagation of signals travelling between transmitting and receiving stations. - KEMO - TV , virtual channel 50 ( UHF digital channel 32 ) , is an Azteca America - affiliated television station serving the San Francisco Bay Area that is licensed to Santa Rosa , California , United States . The station is owned by Northstar Media , LLC. KEMO maintains studios and offices located on 533 Mendocino Ave in Santa Rosa and sales offices in San Jose , and its transmitter is located atop Mount St. Helena . The station is available on cable via Comcast channel 31 , and 719 HD . After reading the paragraphs above, we are interested in knowing the entity with which 'kemo-tv' exhibits the relationship of 'continent'. Find the answer from the choices below. Choices: - europe - north america
A:
north america