<prompt> Waxy flexibility is a characteristic sign of:Excitatory catatoniaStuporous catatoniaObsessive compulsive disorderParanoid schizophrenia  <response>: 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. 