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': 'A patient Mohan, aged 60 yrs, needs an eye examination. He needs a drug which will dilate his eyes but not paralyse his cili Choose the drug: \nSelect and explain. \nA. Atropine, B. Phenylephrine, C. Cyclopentolate, D. Tropicamide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Phenylephrine', 'role': 'assistant'}]