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
Mechanism of action of cephalosporin is: 
Select and explain. 
A. Inhibition of beta-lactamase., B. Inhibition of the synthesis of precursors of peptidoglycan., C. Interference with the synthesis of ergosterol., D. Inhibition of transpeptidation reaction.
D: Inhibition of transpeptidation reaction.
Answer: D: Inhibition of transpeptidation reaction. 
Explanation: None