According to the WHO, what is the minimum bacteriological standard for drinking water -: (A) 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
Answer is A. Ans. is 'a' i.e., All the samples should not contain coliform organisms