Which one of the following is not an inclusion body found in prokaryotes?

Prokaryotes are the primitive organism which lacks membrane-bounded organelles and nucleus. Prokaryotic cells have some microscopic structures in their cytoplasm. They serve specific purposes for the cell. Inclusions are aggregates of specific chemical compounds and often serve as a reservoir of energy or carbon. Common inclusions are poly-hydroxyalkanoate, sulfur globules, cyanophycin globules, and polyphosphate. Polyribosomes (or polysomes) also known as ergosomes are a cluster of ribosomes, bound to the mRNA molecule during translation process found in the eukaryotes. So, the correct answer is Polysome.