Which school of Tibetan Buddhism, introduced by Kalmyk migrants in the 17th century, is historically practised in Kalmykia, Buryatia, and Tuva?

• A Kagyu
• B Nyingma
• C Gelug ✓
• D Sakya

The Gelug (Yellow Hat) school of Tibetan Buddhism, founded by Je Tsongkhapa, spread among the Buryats and Kalmyks; its head is the Dalai Lama.