This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glaucoma, Subject name: Ophthalmology
Which anti-glaucoma drug causes black deposits in conjunctiva? 
Select and explain. 
A. Alpha blocker, B. PG analogue, C. Adrenaline, D. CA inhibitor
C: Adrenaline
Answer: C: Adrenaline 
Explanation: Adrenochrome deposits occur due to alpha agonists on conjunctiva. PG analogues cause hyperpigmentation. Adrenaline/Epinephrine causes black deposits in conjunctiva.