Not seen in faecal pollution -: (A) Staphylococcus, (B) Streptococcus, (C) E. Coli, (D) Clostridium perfringens
Answer is A. The primary bacterial indicators of contamination of water are the coliform group. Supplementary indicators include faecal streptococci and sulphite-reducing clostridia(C.perfringens) Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 780,781