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': 'The causative organism of hemolytic uremic syndrome is \nSelect and explain. \nA. ETEC, B. Shigella, C. Salmonella, D. Pseudomonas', 'role': 'user'}, {'content': "Answer: B \nExplanation: The hemolytic uremic syndrome may occur as a complication in severe cases due to shigella. EHEC can give rise to diarrhea to fatal hemmorhagic colitis and hemmorhagic uraemic syndrome paicularly in young children and the elderly. Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; pg: 293", 'role': 'assistant'}]