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. PGE,, B. PGE2, C. PGF2a, D. PGI2
A: PGE,
Answer: A: PGE, 
Explanation: PGE1 REF: Goodman and Gillman's 11TH edition page 626 "Misoprostol (15-deoxy-16-hydroxy-16-methyl-PGE1; CYTOTEC) is a synthetic analog of PGE1"