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: 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 coil forms, C. 3 coliforms in a 100 ml water, D. I coliform in a 100 ml water', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., All the samples should not contain coliform organisms", 'role': 'assistant'}]