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: Forensic Medicine
[{'content': 'Nihilistic ideas are seen in: PGI 08 \nSelect and explain. \nA. Depression, B. Schizophrenia, C. OCD, D. Anxiety disorders', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Depression', 'role': 'assistant'}]