This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Rhinoscleroma is caused by: 
Select and explain. 
A. Klebsiella, B. Autoimmune, C. Spirochetes, D. Rhinosporidium
A: Klebsiella
Answer: A: Klebsiella 
Explanation: (a) Klebsiella(Ref. Scott Brown, 8th ed., Vol 1; 1212)Rhinoscleroma is a bacterial granuloma caused by Klebsiella rhinoscleromatis also known as Frisch bacillus.Rhinosporidium seeberi, an aquatic protistan protozoa (unicellular) parasite, causes a granulomatous condition called rhinosporidiosis.Spirochete (syphilis) and autoimmune conditions (e.g. Wegener's granulomatosis) are the other nasal granulomatous conditions.