This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormal labor, Subject name: Gynaecology & Obstetrics
Misoprostol is an analogue of 
Select and explain. 
A. PGE1, B. PGE2, C. PGF2alfa, D. PGI2
A: PGE1
Answer: A: PGE1 
Explanation: Misoprostal: PGE-1 Given transvaginally and orally Dose of 25 micrograms every 4 hrs is found to be more effective than PGE -2 for cervical ripening and labor induction. Oral use of misoprostal is less effective than vaginal administration . Ref: Dutta Obs 9e pg 485.