Which of these countries has four official languages?

A multitude of languages are used in Singapore. It consists of several varieties of languages under the families of the Austronesian languages, Dravidian languages and Sino-Tibetan languages. According to the Constitution of Singapore, the national language of Singapore is Malay, which plays a symbolic role, as Malays are constitutionally recognized as the indigenous peoples of Singapore, and it is the government's duty to protect their language and heritage. According to the constitution, the four commonly used languages of Singapore are English, Chinese, Malay and Tamil, with the lingua franca between Singaporeans of different races being English, the de facto main language.

The three languages other than English were chosen to correspond with the major ethnic groups present in Singapore at the time: Mandarin had gained status since the introduction of Chinese-medium schools; Malay was deemed the "most obvious choice" for the Malay community; and Tamil for the largest Indian ethnic group in Singapore, in addition to being "the language with the longest history of education in Malaysia and Singapore". In 2009, more than 20 languages were identified as being spoken in Singapore, reflecting a rich linguistic diversity in the city. Singapore's historical roots as a trading settlement gave rise to an influx of foreign traders, and their languages were slowly embedded in Singapore's modern day linguistic repertoire.