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 arachidonic acid derivative is used in treatment of glaucoma? 
Select and explain. 
A. Latanoprost, B. Iloprost, C. Alprostadil, D. None of the above
A: Latanoprost
Answer: A: Latanoprost 
Explanation: Latanoprost, a stable long-acting PGF2derivative, was the first prostanoid used for glaucoma. The success of latanoprost has stimulated development of similar prostanoids with ocular hypotensive effects, and bimatoprost, travoprost, and unoprostone are now available. These drugs act at the FP receptor and are administered as drops into the conjunctival sac once or twice daily. Adverse effects include irreversible brown pigmentation of the iris and eyelashes, drying of the eyes, and conjunctivitis. Ref: Katzung 11th edition Chapter 18.