Which statement about indirect bilirubin is true?

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Indirect bilirubin is the unconjugated form, formed from heme breakdown, and it travels in the blood bound to albumin. It is not water-soluble, so it cannot be excreted in urine until it is taken up by the liver and conjugated to form direct (conjugated) bilirubin, which is water-soluble and excreted into bile. This makes the statement that indirect bilirubin is unconjugated and protein-bound the correct description. The other ideas misstate its solubility, binding, or excretion pattern.