UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 1166
Question:
A 58 year old developed severe diarrhea following a course of clindamycin. He was treated with metronidazole but he developed cardiac arrest and passed away the next day.
An autopsy was performed and a revealed a grey inflammatory membrane covering the mucosa of the bowel.

The likely causative organism

a) produces a toxin that inhibits cellular protein synthesis
b) is Group A Shigella dysenteriae
c) is a bacteria that has a single circular chromosome
d) is a bacteria that has multiple pili on its cell wall
e) is an organism that releases diphtheria toxin