Question

Which of the following is non pathogenic bacteria of colon?

• A. E. coli
• B. Balantidium coli
• C. Entamoeba coli
• D. Enterbius vermicularis

Answer 1

The correct option is A E. coli

• Escherichia coli, also known as E. coli, is a Gram-negative, facultatively anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms.
• Escherichia coli (E. coli) bacteria normally live in the intestines(colon) of Humans and animals.
  
• E.coli is nonpathogenic bacteria of the colon because it is present in the colon but do not cause any disease.
• So, the correct answer is 'E.coli'.