in the urban areas, in addition to other indigenous languages that are commonly spoken in Zambia. These include Lozi, Tumbuka, Kaonde, Tonga, Lunda and Luvale, which featured on the Zambia National Broadcasting Corporation (ZNBC) local-languages section. Urbanisation has had a dramatic effect on some of the indigenous languages, including the assimilation of words from other languages. Urban dwellers sometimes differentiate between urban and rural dialects of the same language by prefixing the rural languages with 'deep'. Most will thus speak Bemba and Nyanja in the Copperbelt; Nyanja is dominantly spoken in Lusaka and Eastern Zambia. English is used in official communications and is the language of choice at home among – now common – interethnic families. This evolution of languages has led to Zambian slang heard throughout Lusaka and other major cities. The majority of Zambians usually speak more than one language: the official language, English, and the most spoken language in the town or area they live in. Portuguese has been introduced as a second language into the school curriculum due to the presence of a large Portuguese-speaking Angolan community. French is commonly studied in private schools, while some secondary schools have it as an optional subject. A German course has been introduced at the University of Zambia (UNZA). Education The right to equal and adequate education for all is enshrined within the Zambian constitution. The Education Act of 2011 regulates equal and quality education. The Ministry of General Education effectively oversees the provision of quality education through policy and regulation of the education curriculum. Fundamentally, the aim of education in Zambia is to promote the full and well-rounded development of the physical, intellectual, social, affective, moral, and spiritual qualities of all learners. The education system has three core structures: Early childhood education and primary education (Grades 1–7), secondary education (Grades 8–12), and tertiary education. Adult-literacy programs are available for semi-literate and illiterate individuals. The government's annual expenditure on education has increased over the years, from 16.1 percent in 2006 to 20.2 percent in 2015. Health Zambia is experiencing a generalised HIV/AIDS epidemic, with a national HIV prevalence rate of 12.10 percent among adults. However, the country has made progress over the past decade: The prevalence rate of HIV/AIDS for adults aged 15–49 decreased to 13 percent in 2013/14, compared to 16 percent roughly a decade earlier. Other health outcomes have also improved significantly, despite remaining poor by global