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 – a)  E. colib)  Coliformc) Enterococcid) Clostridium difficilee) Streptococcus pyogene \nSelect and explain. \nA. ab, B. bc, C. abc, D. bcd', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bacteriological indicators of water contamination \n\nPresence of following organism indicate fecal contamination of water.\n\n\nColiform : by all practical point of view it is assumed that all coliform are fecal in origin unless a non-fecal origin can be proved.\nFecal streptococci or enterococci : They regularly occur in feces. Finding of fecal streptococci in water is regarded as important confirmatory evidence of recent fecal contamination water.\nClostridium perfringens : They also regularly occur in feces. Presence of spore of Cl. perfringens and absence of coliform group indicate remote contamination of water.', 'role': 'assistant'}]