A) E. coli
B) M. tuberculosis
C) C. botulinum
D) Azotobacter
Correct Answer: A
Solution :
Escherichia coli is a facultative anaerobic bacterium commonly found in human intestinal tract. Its presence in water or food is also an important indication of contamination of faeces. That is why, E. coli is used as a water pollution indicator. E. coli is normally harmless but certain strains can be pathogenic and produce toxins that cause gastrointestinal disturbances. It is responsible for travellers diarrhoea.
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