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
All the following antibiotics act on the cell wall except- 
Select and explain. 
A. Ampicillin, B. Bacitracin, C. Cycloserine, D. Griseofulvin
D: Griseofulvin
Answer: D: Griseofulvin 
Explanation: Ans. is 'd' i.e., Griseofulvin