The answer is letter C. People that are dependent on drugs can stop using the drug without experiencing any side effects. Any person, who become drug-dependent due to his/her condition may leave side effects if they stop using the drug. For example, a person who is drug-dependent to sleeping pills stops taking sleeping pills, as a result the person may experience insomnia and sleeping becomes difficult, because the person is already dependent on the drug, and that the drug is effective.
