Which classification of placental separation is not recognized as an abnormal adherence pattern?
Correct Answer: D
Rationale: Placenta abruptio, also known as abruptio placentae, is the premature separation of the placenta from the uterine wall before delivery. It is not classified as an abnormal adherence pattern like placenta accreta, increta, and percreta. Placenta accreta occurs when the placenta attaches too deeply into the uterine wall. Placenta increta is when the placenta invades the myometrium, and placenta percreta is when it penetrates through the myometrium and reaches the serosa. These abnormal adherence patterns are associated with risks and complications during pregnancy and delivery, while placenta abruptio is a separate condition related to premature placental separation.