Ans: B. Through umbilical vein(Ref: Ghai 8/e p132).Umbilical vein - Preferred route for drug delivery during resuscitation.Due to ease of approach.Veins in scalp or extremities are difficult to access during resuscitation.For umbilical vein catheterization, 3.5 Fr or 5 Fr umbilical catheter inseed into umbilical vein such that its tip is just inside the skin surface and there is free flow of blood.Direct injection into umbilical cord is not desirable.No intracardiac injection recommended.