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: Dental
Co-aggregation is mainly predominated by 
Select and explain. 
A. interaction between Gm + bacteria, B. interaction between Gm - bacteria, C. interaction between Gm + and Gm - bacteria, D. none of the above
B: interaction between Gm - bacteria
Answer: B: interaction between Gm - bacteria 
Explanation: None