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: Surgery
Thiopentone does not cause: 
Select and explain. 
A. Fall in intracranial tension, B. Decreases oxygen consumption of brain, C. Decreases metabolic rate of brain, D. Decreases stage 2 of sleep
D: Decreases stage 2 of sleep
Answer: D: Decreases stage 2 of sleep 
Explanation: Thiopentone decreases oxygen consumption, metabolic rate and ICT. That is why it is agent of choice for cerebral protection. On sleep it increases stage 2 and decreases stage 3, 4 and REM.