This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Schizophrenia Spectrum and Other Psychotic Disorders, Subject name: Psychiatry
[{'content': 'Waxy flexibility is a characteristic sign of: \nSelect and explain. \nA. Excitatory catatonia, B. Stuporous catatonia, C. Obsessive compulsive disorder, D. Paranoid schizophrenia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Waxy flexibility is a sign of catatonia. In waxy flexibility, when examiner makes a passive movement on patient, there is a feeling of plastic resistance which resembles bending of a soft wax candle. It is seen in stupors catatonia more commonly. In excitatory catatonia, instead of stupor, patient shows increased levels of goal less activity.', 'role': 'assistant'}]