This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preterm Labour, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following risk factors is most commonly associated with chorioamnionitis? \nSelect and explain. \nA. Maternal drug abuse, B. Poor maternal hygiene, C. Prior cesarean delivery, D. Prolonged rupture of membranes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Risk factor most commonly associated with chorioamnioitis- Prolonged rupture of membranes Ascending infection is most common and frequently is associated with prolonged membrane rupture and long labor. A variety of organisms may infect the membranes, umbilical cord, and eventually the fetus.', 'role': 'assistant'}]