A. gradual and complete withdrawal from a drug under medical supervision
Explanation:
The question above is related to "drug addiction." In order to manage a drug addict and his withdrawal symptoms, it is important to "detoxify" him. <em>Gradual withdrawal</em> is important in order to prevent the person from experiencing<u> dangerous drug-withdrawal symptoms; so this is</u> done under medical supervision until such time that the person's body will be free from drugs. This is also the same with <em>alcohol addiction. </em>
This process may last to<em> many months</em> depending on the type of drug that the user used.
It controls all parts of the body. It receives and interprets messages from all parts of the body and sends out instructions. The three main components of the central nervous system are the brain, spinal cord and neurons.
