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
In which of the following organs, the effect of atropine on parasympathetic system is of the longest duration ? 
Select and explain. 
A. Eye, B. Heart, C. Salivary glands, D. Urinary bladder
A: Eye
Answer: A: Eye 
Explanation: None