This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Slow wave sleep associated with 
Select and explain. 
A. Dreams, B. Cardiac arrhythmia, C. Penile intumescence, D. Delta activity
D: Delta activity
Answer: D: Delta activity 
Explanation: Slow wave sleep events (Stage 3 & 4 NREM)
-        Somnambulism
-        Night terrors
-        Nocturnal enuresis
-        Bruxism
-        Sleep talking
-        Delta rhythm- Deep sleep (Stage 3 & 4 NREM)