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: Pharmacology
[{'content': 'A 55 years old female comes to the eye casualty with history of severe eye pain, redness and diminution of vision. On examination, the visual acuity is 6/60, there is circumcorneal congestion, corneal oedema and a shallow anterior chamber. Which of the following is the best drug of choice? \nSelect and explain. \nA. Atropine ointment, B. I.V. Mannitol, C. Ciprofloxacin eye drops, D. Betamethasone eye drops', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' i.e., I.V. Mannitol", 'role': 'assistant'}]