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
Which of the following antibiotics is not used in 
the treatment of infectious mononucleosis? 
Select and explain. 
A. Ampicillin, B. Gentamycin, C. Erythromycin, D. Ciprofloxacin
B: Gentamycin
Answer: B: Gentamycin 
Explanation: None