Final answer:
Apo A-I is the apoprotein used for the HDL function of reverse cholesterol transport.
Step-by-step explanation:
The apoprotein used for the HDL function of reverse cholesterol transport is Apo A-I. HDL, or high-density lipoproteins, are responsible for removing excess cholesterol from peripheral tissues and transporting it back to the liver for excretion. Apo A-I is the main protein component of HDL and plays a crucial role in the process of reverse cholesterol transport.