This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special topics, Subject name: Anatomy
[{'content': 'Delusion that nothing exists in this world is \nSelect and explain. \nA. Delusion of influence, B. Nihilistic delusion, C. Delusion of self reproach, D. Erotomania', 'role': 'user'}, {'content': "Answer: B \nExplanation: Nihilistic delusion It is the delusion of hat nothing exists in the world, even he doesn't exist. This type of delusion may be seen in endogenous depression and bipolar disorder. Ref: FORENSIC MEDICINE ANad TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 359", 'role': 'assistant'}]