Pierre has experienced symptoms of depression for years.Sometimes the depression is rather mild,but other times it is debilitating,and he has required hospitalization.Which term is most appropriate for categorizing Pierre's disorder

A)  major depressive disorder
B)  subclinical mood disorder 
C)  disorganized mood disorder
D)  bipolar mood disorder

Major depressive disorder is characterized by the presence of one or more major depressive episodes. These episodes involve symptoms such as depressed mood, loss of interest or pleasure in most activities, significant weight loss or gain, insomnia or hypersomnia, psychomotor agitation or retardation, fatigue or loss of energy, feelings of worthlessness, diminished ability to think or concentrate, and recurrent thoughts of death or suicide. Pierre's history of requiring hospitalization for his symptoms suggests that his depression may be severe enough to meet the criteria for major depressive disorder. The other options - subclinical mood disorder, disorganized mood disorder, and bipolar mood disorder - do not appear to be appropriate based on the information given.