This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adrenergic System, Subject name: Pharmacology
Which of the following drug produce analogous action on dilator pupillae as is produced by pilocarpine on sphincter pupillae? 
Select and explain. 
A. Epinephrine, B. Hydroxyamphetamine, C. Cocaine, D. Timolol
A: Epinephrine
Answer: A: Epinephrine 
Explanation: Ans. (A) Epinephrine(Ref: KDT 8th/e p114, 144)Pilocarpine is a parasympathomimetic drug. It causes contraction of sphincter pupillae and result in miosis. Epinephrine results in contraction of dilator pupillae and result in mydriasis.