biochemistry part1

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the clearence of several substances was measured at constant glomerularfiltration rate n constant urine flow but at in creasing plasmaconcentration of the substance.under these conditions clearence with increase at hifh plasma concentation for which of the foll..options..mannitol,cratinine .phosphate,penicillin,urea

each of the following is character of creatinine except one......options are freely filtered,slightly secreted,slightly absorbed,produced endogenously at a constantratelain the concept.

any one please explain the concept for solving these kind of question...