Which of the following is a classical symptom of depression?

Ans: C (Guilt) Ref: Synopsis of psychiatry-, Kaplan & Sadock, 10th editionExplanationDepressionIt is a common psychiatric syndrome characterized by persistent & pervasive sad mood,Because of such sad mood, the person might feel guilty, which in turn gives rise to thoughts like worthlessness, hopelessness & helplessness (Cognitive triad of Beck), which in turn put him/her at risk of ending life (ie., suicide).The other symptoms mentioned in the question do occur in any psychiatric disorder.So, the best answer would be "'Guilt" which is pathognomonic of depression.