This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
Hot-tub folliculitis is caused by : 
Select and explain. 
A. Staphylococcus aureus, B. Schistosoma, C. Pseudomonas aeruginosa, D. Mycobacterium marinum
C: Pseudomonas aeruginosa
Answer: C: Pseudomonas aeruginosa 
Explanation: Hot-tub folliculitis is caused by Pseudomonas aeruginosa in waters that are insufficiently chlorinated and maintained at temperatures of 37-40degC. Green nails can be caused by Pseudomonas aeruginosa. Acquired from wet environments like swimming pools and sinks. Typically seen in patients with existing nail disease such as onycholysis, or paronychia, have been exposed to moist environments.