Japan is the only Asian country that is a member of which group of major advanced industrialised economies?

Japan is the only Asian member of the Group of Seven (G7), an informal forum of major advanced industrialised economies comprising Japan, the United States, Canada, the United Kingdom, France, Germany and Italy, along with the European Union as a non-enumerated participant. The G7 originated in the mid-1970s (as the G6 in 1975, becoming G7 with Canada's addition in 1976) in response to the global economic shocks of that decade, and it functions as a platform for its members to coordinate policy on macroeconomic management, trade, security and global development issues through annual summits hosted on a rotating basis; Japan hosted the 2023 summit in Hiroshima. Japan's inclusion reflects its status since the postwar decades as the world's second-largest economy for many years (now third, after the United States and China) and its deep integration with Western-aligned market democracies, making it structurally distinct from other large Asian economies that are not G7 members. The G20 is incorrect as the answer here because while Japan is indeed a G20 member, so are China, India, South Korea, Indonesia and Saudi Arabia, meaning Japan is far from the only Asian member of that broader 19-country-plus-EU forum. BRICS is incorrect because Japan is not a member at all; that grouping originally comprised Brazil, Russia, India, China and South Africa and has since expanded, but its composition and rationale are unrelated to Japan's G7 role. The Shanghai Cooperation Organisation is incorrect for the same reason: Japan is not a member of SCO, which instead includes China, Russia, India, Pakistan and several Central Asian states focused on regional security cooperation.