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': 'Criteria for wholesome water? \nSelect and explain. \nA. Free from pathogenic organisms, B. Should be colourless, C. Should be free of chlorine, D. Should be clear', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Free from pathogenic organisms", 'role': 'assistant'}]