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
Bacitracin acts on - 
Select and explain. 
A. Cell Wall, B. Cell Membrane, C. Nucleic Acid, D. Ribosome
A: Cell Wall
Answer: A: Cell Wall 
Explanation: Ans. is 'a' i.e., Cell wall Bacitracin acts by inhibiting cell wall synthesis. o Bacitracin is a polypeptide antibiotic. o Other polypeptide antibiotics (Polymyxin B, colistin and tyrothricin) act on cell membrane.