B

Misoprostol, carboprost (PGF-2α) and oxytocin are recognised uterotonics in the active management of the third stage of labour to prevent postpartum haemorrhage, as highlighted in recent reviews and guidelines [Jones 2023, PMID 36028160; Rajan 2010, PMID 20142654]. Dinoprostone (PGE₂) is primarily employed for cervical ripening and labour induction and is not recommended as a routine prophylactic agent against PPH, so it is the exception.