This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
Time dependent killing and prolonged post-antibiotic effect is seen with: 
Select and explain. 
A. Eluoruquinolones, B. Beta-lactam antibiotics, C. Clindamycin, D. Erythromycin
B: Beta-lactam antibiotics
Answer: B: Beta-lactam antibiotics 
Explanation: beta-lactams, glycopeptides and macrolides produce 'time-dependent inhibition' -antimicrobial action depends on the length of time the concentration remains above MIC ESSENTIALS OF MEDICAL PHARMACOLOGY page no 697