Bangladesh is not a member of which of the following association?

Organization of the Petroleum Exporting Countries (OPEC) is an intergovernmental organization of 13 petroleum-exporting nations, founded in 1960 by the first five members, and headquartered since 1965 in Vienna, Austria. The 13 countries account for 40 percent of global oil production and 73 percent of the world's "proven" oil reserves, making OPEC a major influence on global oil prices.