This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
An infant is brought to the emergency room with hemolytic uremic syndrome and thrombocytopenia. Stool sample was cultured and non-lactose fermenting colonies grown on Sorbitol MacConkey agar, which also fermented glucose with gas. Which one of the following bacteria would most likely be isolated from a stool specimen? 
Select and explain. 
A. Shigella, B. Salmonella, C. Aeromonas, D. E. coli O157/H7
D: E. coli O157/H7
Answer: D: E. coli O157/H7 
Explanation: Ans. is 'd' i.e., E. coli O157/H7EHEC (Enterohemorrhagic E. coliA/erocytotoxin producing E coli) - produces verotoxin (VT) whose major target is vascular endothelial cells - Hemolytic uremic syndrome (HUS), Hemorrhagic colitis - .