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
In treatment of Pseudomonas infections, carbenicillin is frequently combined with : 
Select and explain. 
A. Penicillin, B. Gentamicin, C. Ciprofloxacin, D. Amoxycillin
B: Gentamicin
Answer: B: Gentamicin 
Explanation: None