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
Most potent cycloplegic among the following 
Select and explain. 
A. Tropicamide, B. Cyclopentolate, C. Atropine, D. Umeclidinum
C: Atropine
Answer: C: Atropine 
Explanation: None