The advice that you can provide for him is for Mr Liu to enroll in MA-PD.
Prescription drug coverage can be defined as the coverage that help to cover  prescription drug of the person under the plan.
Based on the given scenario he should enroll in a MA-PD which full meaning is Medicare Advantage Prescription Drug so long as he enrolls in Part B and he is entitled to Part A.
Therefore The advice that you can provide for him is for Mr Liu to enroll in MA-PD.
Learn more about Prescription drug coverage here:https://brainly.com/question/24908169
#SPJ1