system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
K-complex is seen in which stage of sleep cycle-
assistant
The correct answer is  Ans. is 'c' i.e., Stage 2 NREM * Full awake and alert state - Beta rhythm* Awake, eye closed and mind wandering but with less attentiveness - Alpha - rhythm* Stage 1 NREM - Theta rhythm* Stage 2 NREM - Sleep spindles, K complex* Stage 3 & 4 NREM (Deep sleep) - Delta rhythm* REM sleep - Beta rhythm and sometimes also reappearance of alpha rhythm.