Information: - Portland stone is a limestone from the Tithonian stage of the Jurassic period quarried on the Isle of Portland, Dorset. The quarries consist of beds of white-grey limestone separated by chert beds. It has been used extensively as a building stone throughout the British Isles, notably in major public buildings in London such as St Paul's Cathedral and Buckingham Palace. It is also exported to many countriesPortland stone is used in the United Nations headquarters building in New York City, for example. - Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO). - Broadcasting House is the headquarters of the BBC , in Portland Place and Langham Place , London . The first radio broadcast was made on 15 March 1932 , and the building was officially opened two months later , on 15 May . The main building is in Art Deco style , with a facing of Portland stone over a steel frame . It is a Grade II * listed building and includes the BBC Radio Theatre , where music and speech programmes are recorded in front of a studio audience , and lobby that was used as a location for filming the 1998 BBC television series In the Red . As part of a major consolidation of the BBC 's property portfolio in London , Broadcasting House has been extensively renovated and extended . This involved the demolition of post-war extensions on the eastern side of the building , replaced by a new wing completed in 2005 . The wing was named the '' John Peel Wing '' in 2012 , after the disc jockey . BBC London , BBC Arabic Television and BBC Persian Television are housed in the new wing , which also contains the reception area for BBC Radio 1 and BBC Radio 1Xtra ( the studios themselves are in the new extension to the main building ) . The main building was refurbished , and an extension built to the rear . The radio stations BBC Radio 3 , BBC Radio 4 , BBC Radio 4 Extra and the BBC World Service transferred to refurbished studios within the building . The extension links the old building with the John Peel Wing , and includes a new combined newsroom for BBC News , with studios for the BBC News channel , BBC World News and other news programming . The move of news operations from BBC Television Centre completed in March 2013 . The official name of the building is Broadcasting House but the BBC now also uses the term new Broadcasting House ( with a small ' n ' ) in its publicity referring to the new extension rather than the whole building , with the original building known as old Broadcasting House . - Chert is a fine-grained silica-rich microcrystalline or cryptocrystalline sedimentary rock that may contain small fossils. It varies greatly in color (from white to black), but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements present in the rock, and both red and green are most often related to traces of iron (in its oxidized and reduced forms respectively). After reading the paragraphs above, we are interested in knowing the entity with which 'broadcasting house' exhibits the relationship of 'color'. Find the answer from the choices below. Choices: - brown - color - coral - red - white
white