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: Pharmacology
Combination of ampicillin and gentamicin is an example of 
Select and explain. 
A. Indifference, B. Synergy, C. Antagonism, D. Bacterial symbiosis
B: Synergy
Answer: B: Synergy 
Explanation: None