Oxalis tuberosa (Oxalidaceae) is an herbaceous perennial plant that overwinters as underground stem tubers. These tubers are known as oca, from the Quechua words okka, oqa, and uqa ; New Zealand yam; and a number of other alternative names. The plant was brought into cultivation in the central and southern Andes for its tubers, which are used as a root vegetable. The plant is not known in the wild, but populations of wild Oxalis species that bear smaller tubers are known from four areas of the central Andean region. Oca was introduced to Europe in 1830 as a competitor to the potato and to New Zealand as early as 1860. In New Zealand, oca has become a popular table vegetable and is simply called yam.

Grown primarily by Quechua and Aymara farmers, oca has been a staple of rural Andean diets for centuries. Of all Andean root and tuber crops, oca is presently second only to potato in area planted within the Central Andean region. Oca is important to local food security because of its role in crop rotations and its high nutritional content.

Agnes Monica (Traditional Chinese: 楊詩曼; Simplified Chinese: 杨诗曼; pinyin: Yáng Shī-Màn; born Agnes Monica Muljoto; 1 July 1986) is an Indonesian recording artist and actress. Born in Jakarta, Indonesia, she started her career in the entertainment industry at the age of six as a child singer. She has recorded three children's albums which established her as one of Indonesia's most popular child singers in the 1990s. She also became a presenter of several children's television programs. As a teenager, Agnes expanded her career to include acting. Her role in the soap opera Pernikahan Dini rocketed her name into the industry. Following her rising popularity after starring in few series of soap operas, she became the highest-paid teenage artist in Indonesia.

In 2003, she released her fourth studio album And the Story Goes, which marked her transition from a child singer to a female artist. On her fifth studio album, Whaddup A.. '?! (2005), she collaborated with American R&B singer Keith Martin. She also appeared in two Taiwanese drama series, The Hospital and Romance In the White House. She participated in the 2008 and 2009 Asia Song Festival in Seoul, South Korea, and received "Best Asian Artist Award" at each event. Agnes took creative control of her sixth studio album, Sacredly Agnezious (2009), for which she served as the producer and songwriter. In 2010, she was appointed as one of the judges on the talent show Indonesian Idol and was also one of the international hosts of the red carpet at the American Music Awards of 2010 in Los Angeles.