Sciatic vein of frog opens in
Sciatic veins are a part of the renal portal system of frogs. They return blood from each leg and join with the renal portal on their respective sides. The renal portal vein runs outside to the kidneys and receives blood from the dorsolumbar vein and enters the kidney via a number of branches from outer margin. Since the sciatic vein of a frog is not directly related or connected with either heart, pelvic region or liver, the rest of the options are incorrect.So, the correct answer is 'Kidney'.