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
Black deposits on conjunctiva in a patient with glaucoma are seen with the use of: 
Select and explain. 
A. Prostaglandins, B. Carbonic anhydrase inhibitors, C. Epinephrine, D. Beta blocker
C: Epinephrine
Answer: C: Epinephrine 
Explanation: Ans: C. Epinephrine(Ref: Goodman Gilman 12/e p286, 326; Katzung 13/e p161, 12/e p160; The Cornea by Smolin and Thoft's/p504)Black deposits on conjunctiva in a patient with glaucoma are seen with use of epinephrine. Latanoprost is associated with iris hyperpigmentation.Epinephrine is unstable in alkaline solution; when exposed to air or light, it turns pink from oxidation to adrenochrome and then brown from formation of polymers.