This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
[{'content': 'Which of the following has to be present for a 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: One of the following two should be present essentially : -\n\n\nDepressed mood\nMarkedly diminished interest or pleasure in all or almost all activities.', 'role': 'assistant'}]