Question: Cyril P. Callister created what food spread from leftover brewers' yeast extract in 1922?
Context: Cyril Percy Callister (16 February 1893 – 5 October 1949) was an Australian chemist and food technologist who developed the Vegemite yeast spread. Marmite ( ) is the brand name for two similar food spreads: the original British version currently produced by Unilever; and a modified version produced in New Zealand by Sanitarium Health Food Company and distributed in Australia and the Pacific.  Marmite is made from yeast extract, a by-product of beer brewing.  Other similar products include the Australian Vegemite, the Swiss Cenovis and the German Vitam-R. Bovril is the trademarked name of a thick and salty meat extract paste similar to a yeast extract, developed in the 1870s by John Lawson Johnston.  It is sold in a distinctive, bulbous jar.  Bovril is owned and distributed by Unilever UK. Vegemite ( ) is a thick, black Australian food spread made from leftover brewers' yeast extract with various vegetable and spice additives.  It was developed by Cyril Percy Callister in Melbourne, Victoria in 1922.  The Vegemite brand was owned by Mondelez International, but was acquired by the Australian Bega Cheese group following an agreement in January 2017. Cenovis is a product based on yeast extract that is similar to Marmite and Vegemite, rich in vitamin B.  In the form of a dark brown food paste, it is used to flavour soups, sausages and salads.  The most popular way to consume Cenovis, however, is to spread it on a slice of buttered bread, as stated on the product's packaging. YEPD or yeast extract peptone dextrose, also often abbreviated as YPD, is a complete medium for yeast growth.  It contains yeast extract, peptone, double-distilled water, and glucose or dextrose.  It can be used as solid medium by including agar.  The yeast extract will typically contain all the amino acids necessary for growth.  By being a "complete" medium, YEPD cannot be used as a selection medium to test for auxotrophs. Instead, YEPD is used as a growth medium to grow yeast cultures. CC's (pronounced c-ccs) is a brand of flavoured tortilla chips produced since the early 1980s, originally by The Smith's Snackfood Company, and currently by Snack Brands Australia.  CC's are predominantly sold in Australia and come in assorted flavours.  CC's were also sold in New Zealand until Bluebird Foods (the owner of the CC's brand in New Zealand) decided to locally produce the American brand Doritos in March 2010.  The chips are made of ground corn, vegetable oil, and seasoning.  The full ingredients list is vegetable oils (sunflower, palmolein), milk solids (cheese powder), food acids (270, 330, 331), flavour enhancers (621, 627, 631), starch (wheat, maize), vegetable powders (onion, tomato, garlic), salt, sugar, herbs, spice (cumin), flavour (natural and nature identical), yeast extract, vegetable extract (soy, wheat), antioxidants (304, 306). Guinness Yeast Extract, commonly known by its initials GYE, was an Irish savoury spread, made from yeast extract.  It was a by-product of the Guinness beer brewing process and produced by Arthur Guinness Son & Co., Dublin.  The product was launched in Ireland on 2 November, 1936 and discontinued in 1968. Yeast extract is the common name for various forms of processed yeast products made by extracting the cell contents (removing the cell walls); they are used as food additives or flavorings, or as nutrients for bacterial culture media.  They are often used to create savoury flavours and umami taste sensations, and can be found in a large variety of packaged food including frozen meals, crackers, snack foods, gravy, stock and more.  Yeast extracts in liquid form can be dried to a light paste or a dry powder. Kent Callister (born 9 November 1995) is an Australian snowboarder.  He has competed at the 2014 Winter Olympics in Sochi.  His great-grandfather's second cousin, Cyril P. Callister, invented Vegemite.
Answer: Vegemite