This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumonia, Bronchiectasis, and Lung Abscess, Subject name: Medicine
Unipolar flagellate organism that causes pneumonia- 
Select and explain. 
A. Pseudomonas, B. Mycoplasma, C. Aeromonas, D. Klebsiella pneumonia
A: Pseudomonas
Answer: A: Pseudomonas 
Explanation: Ans. is 'a' i.e., Pseudomonas o Pseudomonas aeruginosa is a Gram-negative, aerobic rod shaped and polar-flagella bacterium with unipolar motility.