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: Ophthalmology
[{'content': 'Coloured halos are seen in all, except –a) Mucopurulent conjunctivitis b) Acute anterior uveitisc) Tetracyclined) Glaucoma \nSelect and explain. \nA. bc, B. c, C. ac, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coloured halos are not seen in acute anterior uveitis and this is one of the differentiating points between acute anterior uveitis and acute angle closure glaucoma\nTetracycline does not cause coloured halos.\n\nImportant drugs causing coloured halos\n\nAmiodarone\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nAmyl nitrite\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0\nChloroquine\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 \xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nChlorpromazine\xa0\nCortisone \xa0\xa0\xa0\xa0\nDigoxin\xa0\nFluphenazine\xa0\xa0\nHydrocortisone\xa0\nOral contraceptives\n\xa0Trimethadione\xa0\nPrednisolone\nPromethazine\nSildenafil\nTriflupromazine\nWater (sterile)', 'role': 'assistant'}]