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: Anaesthesia
Which of the following anaesthesia will produce decreased EEG activities – 
Select and explain. 
A. Hypothermia, B. Early hypoxia, C. Ketamine, D. N2O
A: Hypothermia
Answer: A: Hypothermia 
Explanation: Activation of EEG :- Inhalational agent (subanesthetic doses), Barbiturates (small dose), Benzodiazepines (small doses), Etomidate (small doses), Nitrous oxide, Ketamine, Mild hypercapnia, Sensory stimulation, Hypoxia (early).
Depression of EEG :- Inhalational agents (1-2 MAC), Barbiturates, opioids, propofol, etomidate, hypocapnia, marked hypercapnia, Hypothermia, Ischemia, Hypoxia (late).