Lhotshamkha or Nepali is the only Indo-European language spoken as mother tongue by a significant number of people in Bhutan. The language has spread to Bhutan with the Nepalese immigrants who settled in Bhutan in the 20th century and is spoken in the districts of Samtse, Sarpang, Tsirang, Chukha, Dagana and Samdrupjongkhar. The Bhutanese people of Nepali speaking ancestry are referred to by the politically correct term Lhotshampa and their language by Lhotshamkha. The Bahun/Chhetri groups of Nepali speak a distinct Nepali dialect.