question: Q:A 4-week-old newborn is brought to the physician for a well-child examination. He was born at 40 weeks' gestation and weighed 3300 g (7 lb 4 oz). He now weighs 4300 g (9 lbs 1 oz). There is no family history of serious illness. He is at the 50th percentile for height and 50th percentile for weight. Vital signs are within normal limits. Examination shows a grade 3/6 harsh holosystolic murmur at the left lower sternal border and a soft mid-diastolic murmur over the cardiac apex. The lungs are clear to auscultation. The remainder of the examination shows no abnormalities. Which of the following is the most likely explanation for this patient's physical findings?? 
  {'A': 'Communication between the pulmonary artery and the thoracic aorta', 'B': 'Right-to-left shunt through the atrial septum', 'C': 'Left-to-right shunt through the ventricular septum', 'D': 'Right ventricular outflow obstruction', 'E': 'Right-to-left shunt through the ventricular septum'},