Delusion is a pathologically distorted belief, pathological reasoning, and judgment. It has the following characteristics: 1, the content of the belief is inconsistent with the facts, there is no objective reality basis, but the patient is convinced; 2. the delusion content involves the patient himself, Always related to personal interests; 3, delusion has personal uniqueness; 4, delusional content varies due to cultural background and personal experience, but often has a strong color of the times. One of the symptoms described below that can be judged to be delusional is:. ['Xiao Wang has always been thinking about the question of "Eggs first, Chickens first". Although he knows it is not necessary, he just can\'t get rid of this problem from his mind.', 'Lili recently discovered that things and the environment around her have changed and become unreal. The surroundings seem to be stage backgrounds, trees, and houses seem to be paperless and lifeless.', "Lao Zhang has always heard someone scold him at the door, even though the boss told him that he didn't hear anything.", 'Because of an oval birthmark on his abdomen, Xiao Li believes that he is the offspring of a super-powerful alien. Although everyone hears this as nonsense, he is convinced.']