A 4-month old infant is brought to the physician for a routine examination. Physical examination shows epicanthic folds and a palmar simian crease. Cytogenetic testing shows an autosomal trisomy. 
Which of the following cardiac anomalies is most commonly associated with this condition?: (A) Atrial septal defect, (B) Complete Atrioventricularseptal defect, (C) Mitral stenosis, (D) Patent ductusarteriosus
Answer is B. None