This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Which statement regarding delusions is true? \nSelect and explain. \nA. They are almost exclusively found in schizophrenia, B. Grandiose delusions are rarely encountered except in mania, C. They involve a disturbance of thought content, D. They involve a disturbance in perception', 'role': 'user'}, {'content': "Answer: B \nExplanation: Another example is a person who is convinced that he or she is responsible for some disaster (such as fire, flood, or eahquake) with which there can be no possible connection. Delusion of mind being read: The false belief that other people can know one's thoughts. Ref ganong's review of medical physiology 25e p765", 'role': 'assistant'}]