This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
[{'content': 'According to the WHO, what is the minimum bacteriological standard for drinking water \nSelect and explain. \nA. All the samples should not contain coliform organisms, B. 3 consecutive samples of water should not contain any coliforms, C. 3 coliforms in a 100 ml water, D. 1 coliform in a 100 ml water', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) All the samples should not contain coliform organisms > All water intended for drinking, E. coli or thermotolerant coliform must not be detectable in any 100 ml sample / bacteria', 'role': 'assistant'}]