The class of fungi containing 5 orders and 21 families is
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Agaricostilbomycetes
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Atractiellomycetes
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Classiculomycetes
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Cystobasidiomycetes
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Pucciniomycetes
E
Correct answer
Explanation
The Pucciniomycetes (formerly known as the Urediniomycetes) are a class of fungi in the Pucciniomycotina subdivision of the Basidiomycota. The class contains 5 orders, 21 families, 190 genera and 8016 species. It includes several important plant pathogens causing forms of fungal rust.