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
[{'content': 'Which of the following has to be present for diagnosis of major depressive disorder \nSelect and explain. \nA. Loss of interest or pleasure, B. Recurrent suicidal tendency, C. Insomnia, D. Indecisiveness', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In typical depressive episodes of all three varieties described below (mild, moderate, and severe), the individual usually suffers from depressed mood, loss of interest and enjoyment, and reduced energy leading to increased fatigability and diminished activity. Reference: International classification of diseases 10, page 119.', 'role': 'assistant'}]