A certain element 'X' is present in the blood and it is not necessary for the body. In which of the
following, element 'X' will be absent?
(A) In the blood of renal artery
(B) In the blood of renal vein
(C) Absent in the blood of both renal artery and renal vein
(D) Present in the blood of both renal artery and renal vein
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