A 26-year-old woman at 38-weeks of gestation comes to the hospital in labour She has been having an uncomplicated pregnancy so far. All her prenatal testing showed no abnormalities In utero, the fetus has a specialised type of circulation of blood from the mother to the fetus. 
While in utero, which of the following structures shunts blood from the pulmonary artery to the descending aorta?: (A) Ductus arteriosus, (B) Ductus venosum, (C) Foramen ovale, (D) Ligamentum arteriosum
Answer is A. None