This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Most common cause of hemolytic uremic syndrome is - \nSelect and explain. \nA. E.coli, B. Shigella, C. Salmonella, D. Psedononas', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., E.coli Etiology of HUS HUS usually follows an episode of acute gastroenteritis. o Less commonly, patient may present after an upper respiratory tract infection. o The organisms responsible are - E.coli (most common) EHEC (shiga toxin producing) Salmonella Shigella dysenteriae Streptococcus pneumoniae Baonella Campylobacter Viruses (Coxsackie virus, echovirus, influenza, varicella, HIV, EBV).", 'role': 'assistant'}]