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
Most common, and most serious cause of infection by pseudomonas is seen in patients with 
Select and explain. 
A. Burns, B. Neutropenia, C. Catheterization, D. None of the above
A: Burns
Answer: A: Burns 
Explanation: → P.aeruginosa is pathogenic only indicated into areas devoid of normal defences e.g. when mucous membrane is disrupted, patient is catheterized, neutropenia is there.
→ Most common, and most serious cause of infection is burns.
→ Most common infection outside hospital is suppurative otitis media .
→ Causative agent of shanghai fever.
→ Produce blue pus, with characteristic fruity odour 
→ Pathognomonic skin lesions are called ecthyma gangrenosum, which occur singly or in small numbers on the perineum, buttocks, and extremities.
→ Resistant to common antiseptic and disinfectants such as Dettol  in contrary, it may grow profusely in bottle of these antiseptic.