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
In case of anisocoria when 1% pilocarpine is instilled into the eye with abnormally dilated pupil, pupil remains dilated. Cause of anisocoria may be: 
Select and explain. 
A. Adies pupil, B. Pharmacological blockage, C. Uncal herniation, D. Diabetic III cranial nerve palsy
B: Pharmacological blockage
Answer: B: Pharmacological blockage 
Explanation: Ans. Pharmacological blockage