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Out of 1800 litres of blood circulating through kidneys per day we filter out 180 litres of plasma and out of this we form only 1.45 litres of urine due to which of these mechanisms:

[A].	Selective re-absorption	[B].	Secretion by tubules
[C].	Both by selective re-absorption and secretion	[D].	By something else

Answer: Option C

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