<prompt> Which of the following risk factors is most commonly associated with chorioamnionitis?Maternal drug abusePoor maternal hygienePrior cesarean deliveryProlonged rupture of membranes  <response>: 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. 