This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Lens), Subject name: Ophthalmology
[{'content': 'Complication in a patient with Long term use of contact lens is most commonly caused by? \nSelect and explain. \nA. Aspergillus, B. Acanthameoba, C. Pneumococcus, D. Pseudomonas', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) PseudomonasRef: A.K. Khurana 6th ed. 198PSEUDOMONAS* Pseudomonas is the commonest organism affecting long term use of contact lens followed by acanthameoba. SIGNS suggesting the former infection: presence of ring shaped ulcer, lack of vascularization, pain out of proportion, pseudodendritis.PNEUMOCOCCUS* The commonest cause of corneal ulcer in India is Streptococcus Pneumonia (causes central corneal ulcer) whereas the commonest cause in the world is staphylococcus aureus (causes peripheral corneal ulcer).* The bacterial ulcer can present with the formation of a hypopyon (sterile).* The characteristic hypopyon corneal ulcer is due to pneumococcus and is called ulcus serpens.* Treatment : topical gentamicin/ tobramycin and cephalozin with cycloplegics( atropine ointment or drops) and analgesics.', 'role': 'assistant'}]