In the accompanying photomicrograph of colon,a fibrinous exudate (E)is seen erupting from the surface of the colonic mucosa.Which one of the following organisms characteristically causes such a microscopic picture?

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Clostridium difficile characteristically causes pseudomembranous colitis,so-called because the membrane is not a true epithelial membranEPseudomembranous colitis is typically caused by broad-spectrum antibiotics of any type,but is usually associated with clindamycin.

In the Accompanying Photomicrograph of Colon,a Fibrinous Exudate (E)is Seen