<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 32-year-old G2P0 presents at 37 weeks gestation with a watery vaginal discharge. The antepartum course was remarkable for an abnormal ultrasound finding at 20 weeks gestation. The vital signs are as follows: blood pressure, 11080 mm Hg; heart rate, 91min; respiratory rate, 13min; and temperature, 36.4C 97.5F. The fetal heart rate is 141min. On speculum examination, there were no vaginal or cervical lesions, but there is a continuous watery vaginal discharge with traces of blood. The discharge is fern- and nitrite-positive. Soon after the initial examination, the bleeding increases. Fetal monitoring shows a heart rate of 103min with late decelerations. Which of the following ultrasound findings was most likely present in the patient and predisposed her to the developed condition?? A: Loss of the normal retroplacental hyperechogenic region, B: Velamentous cord insertion, C: Retroplacental hematoma, D: Subchorionic cyst, E: Placental edge-internal os distance of 3 cm,  <response>: This is a clinical vignette describing a 32-year-old pregnant woman at 37 weeks gestation who presents with symptoms suggestive of placental abruption, including watery vaginal discharge with blood, fetal tachycardia, and late decelerations on fetal monitoring. The question asks about an abnormal ultrasound finding at 20 weeks gestation that likely predisposed the patient to developing this condition. Placental abruption is often associated with abnormalities like placenta previa, vasa previa, or velamentous cord insertion that can be detected on ultrasound. Choice A describes loss of the retroplacental hyperechogenic region, which may indicate placental abruption or retroplacental hematoma. This could predispose to abruption but would likely be seen later in pregnancy. Choice B describes velamentous cord insertion, which is when the umbilical cord inserts into the membranes before reaching the placenta. This increases risk for vasa previa and abruption. Choice C describes a retroplacental hematoma, which indicates that abruption has already occurred and would not predispose to it. Choice D describes a subchorionic cyst, which is unlikely to be related to placental abruption.Choice E describes a short placental edge-internal os distance, concerning for placenta previa which can predispose to abruption. However, previa would likely cause painless bleeding earlier in pregnancy.B: Velamentous cord insertion 