This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histamine, 5-HT and PGs, Subject name: Pharmacology
A relatively newer agent 'latanoprost' is now being used. Which of the following statements is true regarding this agent? 
Select and explain. 
A. It is PGF2a derivative used in glaucoma, B. It is selective a1 blocker used in benign hyperophy of prostate, C. It is a 5a reductase inhibitor used to reduce the size of enlarged prostate gland, D. It is a PGE2 analogue used intravaginally for cervical priming
A: It is PGF2a derivative used in glaucoma
Answer: A: It is PGF2a derivative used in glaucoma 
Explanation: -Latanoprost is PGF2 alpha derivative. -It is drug of choice for primary open angle glaucoma. -Heterochromia iridis and hyperichosis are major ocular adverse effects of latanoprost.