title: Swahili language
context: Swahili has become a second language spoken by tens of millions in three African Great Lakes countries (Tanzania, Kenya, and the DRC) where it is an official or national language. In 1985, with the 8-4-4 system of education, Swahili was made a compulsory subject in all Kenyan schools.[23] Swahili and closely related languages are spoken by relatively small numbers of people in Burundi, Comoros, Malawi, Mozambique, Uganda, Zambia and Rwanda.[24] The language was still understood in the southern ports of the Red Sea in the 20th century.[25][26]
question: What countries have Swahili as an official language?
answers: Tanzania, Kenya, and the DRC