Which country is the largest producer of butter?
India, according to the 2010 World Book Encyclopedia. The United States is second.
Africa has the largest producer in the world Africa is not a country - it is a continent. Zimbabwe (a country within the continent of Africa) has largest known concentration of diamonds in the world. Actually, I believe that Botswana is the largest producer of diamonds in the world. If Zimbabwe had as much in reserves of diamonds as Botswana, they would probably have their own currency.
There is only one country in Australia, and that is Australia. It is both a country and a single continent. Australia is currently the world's fourth largest producer of black coal, the fifth largest producer of brown coal (even though it is ranked first in recoverable brown coal resources), and the largest exporter of coal.