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 drugs acts by inhibiting cell wall synthesis ? 
Select and explain. 
A. Erythromycin, B. Cephalosporins, C. Chloramphenicol, D. Sulfonamides
B: Cephalosporins
Answer: B: Cephalosporins 
Explanation: None