The right adrenal vein drains into: (A) Right renal vein, (B) Inferior vena cava, (C) Second right lumbar vein, (D) Third right lumbar vein
Answer is B. These blood vessels supply a network of small aeries within the capsule of the adrenal glands. Venous blood is drained from the glands by the suprarenal veins, usually, one for each gland: The right suprarenal vein drains into the inferior vena cava. ref - semantischolar.org