Yersinia infection of the ileum, showing superficial necrosis of the mucosa and ulceration is most probably caused by:
A. Yersinia enterocolitica
B. Yersinia pestis
C. Neither Yersinia enterocolitica nor Yersinia pestis
D. Both Yersinia enterocolitica and Yersinia pestis
Answer: A. Yersinia enterocolitica
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