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
Commonly used in narcoanalysis 
Select and explain. 
A. Atropine, B. Scopolamine, C. Opium, D. Thiopentone
D: Thiopentone
Answer: D: Thiopentone 
Explanation: D i.e. Thiopentone