**Core Concept**
In term neonates, the transition from fetal to neonatal circulation involves a series of physiological changes that ensure adequate oxygenation and nutrient delivery. One key aspect of this transition is the presence of certain anatomical and physiological findings that are considered normal in the newborn period.

**Why the Correct Answer is Right**
The correct answer refers to the presence of a patent ductus arteriosus (PDA) in term neonates. A PDA is a normal finding in the newborn period, allowing for shunting of blood from the pulmonary artery to the aorta, reducing pulmonary vascular resistance and ensuring adequate systemic blood flow. This is mediated by the high levels of prostaglandins, particularly PGE2, which are produced by the fetal ductus arteriosus. As the neonate transitions to air breathing, the levels of PGE2 decrease, and the ductus arteriosus starts to close.

**Why Each Wrong Option is Incorrect**
**Option A:** This is not a normal finding in term neonates. While it is a common congenital anomaly, it is not typically present at birth and may be associated with cardiac anomalies.
**Option B:** This is a normal finding in term neonates, but it is not as significant as a PDA in terms of clinical impact. The foramen ovale is a patent foramen ovale (PFO) in the majority of newborns, which typically closes within the first few months of life.
**Option C:** This is not a normal finding in term neonates. A secundum atrial septal defect (ASD) is a congenital anomaly that involves an abnormal opening in the atrial septum, which can lead to shunting of blood between the atria.

**Clinical Pearl / High-Yield Fact**
In term neonates, a patent ductus arteriosus is a normal finding that typically closes within the first few days of life. However, in preterm infants, a PDA may remain patent and require medical closure.

**Correct Answer: D. Patent ductus arteriosus**