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: Microbiology
[{'content': 'All are true about enterohemorrhagic E.coli Except- \nSelect and explain. \nA. Sereny test positive, B. May cause diarrhoea, C. Can cause hemolytic uremic syndrome, D. Verocytotoxin is produced', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]