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': 'A false belief unexplained by reality, shared by a number of people is: \nSelect and explain. \nA. Superstition, B. Illusion, C. Delusion, D. Obsession', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. SuperstitionNormal thinking is characterized by smooth & continuous flow or fluency (continuity), reasonable speed, clear goal directed logical organization (clarity & organization), with a logic, sequence, intent and control. Whereas, constant/firm belief held on inadequate grounds is delusion.', 'role': 'assistant'}]