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
Cell wall synthesis is inhibited by all except: 
Select and explain. 
A. Lincomycin, B. Penicillin, C. Cephalexin, D. Ampicillin
A: Lincomycin
Answer: A: Lincomycin 
Explanation: None