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': 'In case of anisocoria when 1% pilocarpine is instilled into the eye with abnormally dilated pupil, pupil remains dilated. Cause of anisocoria may be: \nSelect and explain. \nA. Adies pupil, B. Pharmacological blockage, C. Uncal herniation, D. Diabetic III cranial nerve palsy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Pharmacological blockage', 'role': 'assistant'}]