USMLE step 2 Mcq 283:A middle aged male patient has chronic diarrhea

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Question:
A middle aged male patient has chronic diarrhea. Colonoscopy revealed colonic ulcers which were biopsied. Histology revealed flask shaped ulcers. Flask shaped ulcers in the large intestines are typically caused by which of the following organisms:

a) Salmonella typhi
b) Entaomoeba histolytica
c) Mycobacterium bovis
d) Staphlococcus aureus
e) none of the above


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