This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Most dominant colonic bacteria is - 
Select and explain. 
A. E. coli, B. Bacteroides, C. Clostridium, D. Veilonella
B: Bacteroides
Answer: B: Bacteroides 
Explanation: None