Which of the following four countries is the only one to recognize sign language as an official language?

In 2005, Mexican Sign Language was officially declared to be a "national language" of Mexico.

According to the World Health Organization (WHO), as of 2020 some 5% of the world population suffered from hearing loss. The percentage may seem low, but in cold hard numbers it means that some 360 million people worldwide are deaf, or have hearing loss.

Fortunately for these individuals, most languages today have a variation of sign languages. It is estimated that there may be as many as 300 different sign languages.

However, only 41 countries worldwide have legally acknowledged sign language as an “official” language. Of the 41 countries which do, 26 are in Europe; the European Parliament approved a resolution requiring all member states to adopt sign language in an official capacity on June 17, 1988.

Of the remaining fifteen countries, six are in South America, and four are in Africa: Kenya, Uganda, Zimbabwe and South Africa. Two (Papua New Guinea and New Zealand) are located in Oceania, and another two (South Korea and Japan) are in Asia.

The United States does not identify any language, signed or spoken, as its official language, although some individual states recognize American Sign Language as a “foreign language”.

Other countries also give sign language partial recognition, for example: Thailand recognizes Thai Sign Language as "the national language of deaf people in Thailand”, and Australia recognizes the Australian Sign Language as a “community language”.