Question

severe drug - related problem characterized by impaired control over the use of the drug
chemical dependency
alcohol dependence
panic disorder
drug dependence
sleep disorder

Explanation:

Chemical dependency is a general term for severe problems with drug use involving impaired control. Alcohol dependence is specific to alcohol. Panic disorder is an anxiety - related issue. Sleep disorder is about sleep. Drug dependence is a narrower term (though related). Since the question is about a general drug - related problem (not specific to alcohol), chemical dependency is the best fit.

Answer:

chemical dependency