This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Following drugs are effective in cases of pneumocystis jirovecii EXCEPT 
Select and explain. 
A. Pentamidine, B. Trimethoprim-dapsone, C. Clindamycin plus primaquine, D. Cefepime
D: Cefepime
Answer: D: Cefepime 
Explanation: Trimethoprim-sulfamethoxazole,which acts by inhibiting folic acid synthesis,is considered the drug of choice for all forms of Pneumocystis jirovecii pneumonia.Therapy is continued for 14 days in non-HIV infected patients & for 21 days in persons infected with HIV.Alternative regimens include TMP plus dapsone and clindamycin plus primaquine.Parenteral pentamidine is also effective. Reference:. Davidson edition23rd pg 584