<prompt> All are true regarding pseudomembranous colitis, exceptIt is caused by clostridium difficileThe organism is a normal commensal of gutIt is due to production of phospholipase AIt is treated by vancomycin  <response>: Clostridium difficile causes acute colitis with bloody diarrhea and pseudomembranous colitis. A common cause of nosocomial diarrhea. The disease follows the use of broad-spectrum antibiotics to which it is resistant. Exotoxin A and B involved in the pathogenesis. It is not a normal commensal, it is an oppounistic organism. Reference: Textbook of Microbiology; Anathanarayan and panikers; 10th edition; Page no: 270 