This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mood Disorders, Subject name: Psychiatry
The period of normalcy is seen between two psychosis. The diagnosis is: 
Select and explain. 
A. Schizophrenia, B. Manic depressive psychosis, C. Alcoholism, D. Depression
B: Manic depressive psychosis
Answer: B: Manic depressive psychosis 
Explanation: Manic depressive psychosis was the older name for bipolar disorder. In bipolar disorder, in between the episodes, patient is usually normal. Bipolar disorder: Episodes of - both mania (continuing or at least 1 week) and depression (bipolar I disorder) -both hypomania (continuing or at least 4 days) and depression (bipolar II disorder)