Answer:
The correct option is : c. bipolar disorder
Explanation:
A manic depressive illness also known as bipolar disorder, is a serious mental disorder in which the person experiences extreme mood swings ranging from manic highs to depressive lows. The manic highs includes high energy, abnormally elevated mood and reduced need for sleep. Whereas, depressive lows include low energy, loss of interest and even suicidal thoughts.
Therefore, bipolar disorder causes manic-depressive illness in an individual.
