Although the term "depression" is popularly applied to numerous episodes of sadness or a bad mood, in clinical psychology it is a serious and often disabling condition that significantly affects a person's work, family and school life, sleeping and eating habits and general health.


A. it is a serious

B. they refer to it as a serious

C. it referred to a serious

D. it refers to a serious

E. it is in reference to

OA D

Source: Economist Gmat