This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Most predominant normal flora of human intestine is: \nSelect and explain. \nA. Escherichia coli, B. Streptococci, C. Bacteroides, D. Enterococci', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. BacteroidesMost common flora in humans is Bacteroides fragilis, which is an anaerobe. Among aerobes, Escherichia coli is the most common bacteria as a part of normal intestinal flora.', 'role': 'assistant'}]