<prompt> Lucid interval is seen inSyphilisMalignant diseaseInsanityElectrical shock  <response>: C Insanity Lucid Interval: This is a period occurring in insanity, during which all symptoms of insanity disappear completely. The individual is able to judge his acts soundly, and he becomes legally liable for his acts. The period of lucid interval varies from person to person from time to time in the same person as such one cannot be certain about the time when a person passes again in the state of insanity. 