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
Misoprostol is an analogue of : 
Select and explain. 
A. PGE1, B. PGE2, C. PGF2, D. PGI2
A: PGE1
Answer: A: PGE1 
Explanation: None