This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
Which of the following organisms is known to cause Atrophic Rhinitis 
Select and explain. 
A. Klebsiella pneumonia, B. Klebsiella Ozaena, C. Streptococcus pneumonia, D. Streptococcus foetidis
A: Klebsiella pneumonia
Answer: A: Klebsiella pneumonia 
Explanation: Klebsiella pneumonia is known to cause atrophic rhinitis Various organisms have been cultured from cases of atrophic rhinitis such as Klebsiella ozaenae, (Perez bacillus), diphtheroids, Proteus vulgaris, Escherichia coli,staphylococci and streptococci but they are all considered to be secondary invaders responsible for foul smell rather than the primary causative organisms of the disease. Ref: Dhingra 7e pg 173.