This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Sereny test is positive for \nSelect and explain. \nA. ETEC, B. EPEC, C. EIEC, D. EAEC', 'role': 'user'}, {'content': "Answer: C \nExplanation: Sereny's test is positive in EIEC (Enteroinvasive E.coli). Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg: 285", 'role': 'assistant'}]