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
The following organisms are known to develop resistance to Penicillin except : 
Select and explain. 
A. Staphylococcus, B. Streptococcus, C. Pneumococcus, D. Treponema
D: Treponema
Answer: D: Treponema 
Explanation: None