This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following antibiotics acts by inhibiting cell wall synthesis? 
Select and explain. 
A. Cefepime, B. Aminoglycosides, C. Erythromycin, D. Doxycycline
A: Cefepime
Answer: A: Cefepime 
Explanation: Ans. is 'a' i.e. Cefepime