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
Which of the following drugs acting on dilator pupillae has an action analogous to that of pilocarpine on sphincter papillae? 
Select and explain. 
A. Timolol, B. Epinephrine, C. Neostigmine, D. Tropicamide
B: Epinephrine
Answer: B: Epinephrine 
Explanation: Ans: B. Epinephrine(Ref Goodman Gilman 12/e p326,. Katzung, 13/e p162, 12/e p160,. KDT 7th/e p153. 6th/e p123).Epinephrine acts on dilator pupillae, causing the dilatation of pupil analogous to that of pilocarpine on sphincter papillae.Sympathetic stimulation of adrenergic receptors causes the contraction of the radial muscle and subsequent dilation of the pupil.Parasympathetic stimulation causes contraction of the circular muscle and constriction of the pupil.