Answer:
Detoxification
Step-by-step explanation:
In this scenario, the process that is being mentioned is known as Detoxification. This is the physiological or medicinal removal of toxic substances from a living organism, including the human body, which in a living being is done naturally by the liver. When an individual (like Marcus) is addicted to a certain drug and wants to get clean, they first need to clean out their system of any trace of the drug. This can be a painful process since the body begins to need and depend on the drug.