Question: What product are Arla Foods and their subsidiary, Arla, leading producers of?

Context paragraphs:
Jens Bigum: Jens Jørgen Bigum (born 28 July 1938) is a Danish business executive and former CEO of Arla Foods.

Milk Link: Milk Link is a large dairy company in the United Kingdom.  It is the UK's largest dairy cooperative and the UK's largest producer of cheese.  In 2012 the company merged with Arla Foods.

Gotland Blue: Gotland Blue (Swedish: "Blå Gotland" , German: "Gotland Blau" ) is a cheese that was made in Sweden by the Arla Foods company in the town of Stånga on the island of Gotland.  This cheese is often characterized as being somewhere between strong and mild, containing elements of both types.  The colour is a pale yellow, with no holes.  It is similar to Emmentaler in texture, but has a flavour reminiscent of stronger cheeses.  The cheese is cube shaped and covered in a blue wax, thus making the cheese take on visual cues from the Swedish flag and national colours.  Blå Gotland was sold in Sweden and in Germany.

Arla Foods UK: Arla Foods UK plc is a major dairy products company in the United Kingdom, based in Leeds, and a subsidiary of the Swedish-Danish Arla Foods Group.

Castello cheeses: Castello is a brand of cheeses produced by Arla Foods amba, an agricultural marketing cooperative based in Denmark.

Lurpak: Lurpak is a Danish brand of butter owned by the Danish Dairy Board (in turn part of Arla Foods).  It is sold in 75 countries worldwide and is best known for its distinctive silver packaging.  Lurpak started in 1901 as a combination of several Danish dairy farmers to create a common brand for butter to increase sales.  The distinctive logo is based on the 'Lur' an ancient musical instrument.  A set of six 'lurs' was found in Denmark at the end of the 18th Century.  Despite Arla Foods' Swedish origin, the product is not sold in Sweden - possibly due to the fact that 'lur' also means 'scam' in Swedish slang.

Arla Foods: Arla Foods is an international cooperative based in Viby, Denmark, and the largest producer of dairy products in Scandinavia.  Arla Foods was formed as the result of a merger between the Swedish dairy cooperative Arla and the Danish dairy company MD Foods on 17 April 2000.

Skånemejerier: Skånemejerier, based in Skåne County, is a Swedish cooperative and Sweden's largest producers of dairy products after Arla Foods and Milko.

Lactofree: Lactofree is a brand of lactose free dairy products aimed at individuals with lactose intolerance.  The brand was launched by Arla Foods UK in 2006 and is available in the UK.  In September 2010, Lactofree began licensing its lactose removing patent to other producers.

Arla (Finland): Arla Oy is one of the largest food manufacturers in Finland, holding a leading position in the dairy sector in Finland.  It's a subsidiary of Danish-Swedish company Arla Foods.

Supporting paragraphs: Arla (Finland) Arla Foods
Answer: dairy