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': 'Indication of Fecal contamination of water is due to presence of- \nSelect and explain. \nA. E. coil, B. Coliform, C. Enterococci, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is `a' i.e., E. coli; 'b' i.e., Coliform; sc' i.e., Enterococci Bacteriological indicators of water contamination o Presence of following organism indicate fecal contamination of water. 1) Confirm : by all practical point of view it is assumed that all coliform are fecal in origin unless a non-fecal origin can be proved. 2) Fecal streptococci or enterococci : They regularly occur in feces. Finding offecal streptococci in water is regarded as impoant confirmatory evidence of recent fecal contamination water. 3) Clostridium perfringens : They also regularly occur in feces. Presence of spore of Cl. perfringens and absence of col i form group indicate remote contamination of water.", 'role': 'assistant'}]