Which country hosted the 2018 Asian Games?

Concept: The Asian Games is a quadrennial multi-sport event organised by the Olympic Council of Asia (OCA); each edition is awarded to and hosted by one nominated country/city, distinct from sub-regional events like the SEA Games (hosted by ASEAN member states).

Application: The 18th Asian Games (2018) were hosted by Indonesia, held jointly across two cities — Jakarta (the capital) and Palembang — the first time in the Games' history that hosting duties were split between two cities.

Cross-check: Contrasting the other offered countries by their own hosting history confirms the answer:

• Thailand hosted several earlier editions (1966, 1970, 1978, 1998), but not the 2018 edition.

• Malaysia's most recent major regional hosting was the 2017 SEA Games (Kuala Lumpur) — a separate, ASEAN-only event, not an OCA Asian Games edition.

• Qatar hosted an Asian Games edition in 2006 (Doha) — an earlier host year, not 2018.