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: Microbiology
Which organism cannot be cultured ? 
Select and explain. 
A. Klebsiella rhinoscleromatis, B. Klebsiella ozaenae, C. Klebsiella granulomatis, D. Pneumocystis jiroveci
D: Pneumocystis jiroveci
Answer: D: Pneumocystis jiroveci 
Explanation: Ans. is 'd' i.e., Pneumocytstis jiroveci "The life cycle of pneumocystis probably involves sexual and asexual reproduction, although definitive proof awaits the development of a reliable culture system". - Harrison "Rhinosporidium seeberi has not been cultivated in media". - Ananthnarayan.