This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Which is the shortest acting mydriatic? 
Select and explain. 
A. Atropine, B. Tropicamide, C. Cyclopentolate, D. Homatropine
B: Tropicamide
Answer: B: Tropicamide 
Explanation: Ans. (B) Tropicamide(Ref: Katzung 11/e p124)Atropine is longest acting (5-6 days) whereas tropicamide is the shortest acting (15-60 min) mydriatic.