G5 are the five most important emerging economies of the world. Which one of…

Concept

A "G-n" bloc is an informal grouping whose membership is settled by agreement among its participants, not derived from any economic formula. Identifying a non-member therefore means recalling the exact roster rather than reasoning from a country’s size or wealth. One step comes before that: the same label can belong to two different blocs, so a qualifier in the stem is what decides which roster applies.

Application

The stem qualifies the group as "emerging economies", which anchors the G5 also known as the Outreach Five (O5) — the five major emerging economies brought into structured dialogue with the G8 from the 2005 Gleneagles Summit and formalised through the Heiligendamm Process in 2007. Its roster is:

• Brazil

• China

• India

• Mexico

• South Africa

Checking the four names offered against that roster: Mexico, Brazil and China each appear on it, while Korea does not. Korea is the economy that does not form part of the G5.

Cross-check

The label "G5" also names an older bloc of major industrialised economies, so it is worth confirming that the choice does not flip under the other reading:

Korea appears in neither roster, so the answer is stable whichever G5 is meant. Korea’s own multilateral affiliations are the OECD, joined in 1996, and the G20 — not the G5.