<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 27-year-old G2P1 female gives birth to a baby girl at 33 weeks gestation. The child is somnolent with notable difficulty breathing. Pulse pressure is widened. She is profusely cyanotic. Auscultation is notable for a loud single S2. An echocardiogram demonstrates an enlarged heart and further studies show blood from the left ventricle entering the pulmonary circulation as well as the systemic circulation. Which of the following processes was most likely abnormal in this patient?? A: Closure of an aorticopulmonary shunt, B: Formation of an atrioventricular valve, C: Formation of the interatrial septum, D: Spiraling of the truncal and bulbar ridges, E: Formation of the aorticopulmonary septum,  <response>: This is a question about a newborn with symptoms of heart failure and cyanosis, along with echocardiogram findings of blood shunting between the pulmonary and systemic circulations. This indicates a failure to properly separate the pulmonary and systemic circulations during fetal development. The choices describe various embryologic processes in heart development. Choice A describes closure of a shunt between the aorta and pulmonary artery, which is normal in fetal development. Choices B and D describe formation of valves and spiraling of ridges, which are not related to separating circulations. Choice C describes formation of the interatrial septum, which separates the left and right atria but not the ventricles. Choice E describes formation of the aorticopulmonary septum, which divides the truncus arteriosus into the aorta and pulmonary artery, separating systemic and pulmonary circulations. Therefore, choice E, describing failure of the aorticopulmonary septum to form properly, leading to a persistent truncus arteriosus, is the most likely abnormality resulting in this clinical presentation.E: Formation of the aorticopulmonary septum 